Some context: Late Night with Conan O'Brien is an American late-night talk show hosted by Conan O'Brien that aired 2,725 episodes on NBC between 1993 and 2009. The show featured varied comedic material, celebrity interviews, and musical and comedy performances. Late Night aired weeknights at 12:37 am Eastern/11:37 pm Central and 12:37 am Mountain in the United States.
O'Brien's Late Night debuted on September 13, 1993, with Andy Richter chosen as O'Brien's sidekick. The premiere episode featured John Goodman (who received a "First Guest" medal for his appearance), Drew Barrymore, and Tony Randall. The episode featured a cold open of O'Brien's walk to the studio with constant reminders that he was expected to live up to Letterman, parodying a popular sentiment expressed in the media at the time. After seeming to be unaffected by the comments, O'Brien arrives at his dressing room and cheerfully prepares to hang himself. However, a warning that the show is about to start causes him to abandon his plans.  O'Brien's inexperience was apparent and the show was generally considered mediocre by critics in terms of the host's ability. The Chicago Sun-Times' Lon Grankhe called O'Brien "nervous, unprepared and generally geeky" and Tom Shales wrote "As for O'Brien, the young man is a living collage of annoying nervous habits. He giggles and titters, jiggles about and fiddles with his cuffs. He has dark, beady little eyes like a rabbit. He's one of the whitest white men ever." (O'Brien wrote for The New York Times a satirical review of the first episode the day it aired titled "O'Brien Flops!", in which he told readers "Frankly, I was not impressed".) The originality and quality of the comedy, however, led by original head writer Robert Smigel, was widely praised. Although O'Brien benefited by comparison from the quick critical and commercial failure of the fellow new late-night The Chevy Chase Show, NBC only offered short-term contracts, 13 weeks at a time and once for six weeks, as widely reported by the press at the time. O'Brien was reportedly almost fired at least once in this period, but NBC had no one to replace him. According to Smigel, "We were basically canceled at Conan, and then they changed their minds in August of '94, gave us a reprieve."  According to O'Brien a network executive told him, in regards to Andy Richter, he'd "never succeed until I 'got rid of that big fat dildo.' That was the tone of the conversations between us and the network." It was widely expected that the host of Talk Soup, Greg Kinnear would take over the role, but Kinnear turned down the opportunity and decided to pursue a career in acting. Stars like Tom Hanks agreed to appear on Late Night, which boosted audience awareness. Even Letterman, who admired O'Brien's comic sensibility, appeared as a guest to register his support. O'Brien's performance style improved through experience and he began to receive more favorable reviews and ratings the following year. With the ratings gradually improving over the course of two years, Late Night reached a new level of critical and commercial success in 1996. Tom Shales officially recanted his previous critical review with the headline "I was wrong", and O'Brien received his first Emmy writing nomination, which he has gone on to receive every year since.
how was the show received?
A: generally considered mediocre by critics in terms of the host's ability.

Some context: Lane was born Morton Donald Isaacson at the Manhattan "Flower Hospital" in New York City to a Jewish father (Jacob) and a Catholic mother (Dolly), who later converted to Judaism. Jacob "Jack" Isaacson was a sergeant in the New York City Police Department (NYPD) and Dolly was a homemaker. He was raised in The Bronx, where he attended DeWitt Clinton High School and was classmates with Judd Hirsch and Garry Marshall. By his mid-teens, due to his mother's influential personality, Isaacson had decided he wanted to be in show business.
In 1965 the Irish comedian Dave Allen presented a talk show on Sydney television for TCN-9. He was eventually sacked and Nine producer John Collins looked for replacement hosts to fill in for the rest of the season. After a series of temporary hosts, Collins found Lane working in The Dunes Nightclub in Hawaii. While in the United States, Collins asked Las Vegas performer Wayne Newton if there was anybody he should consider as a replacement; Newton's answer was "Don Lane".  Lane was offered the job after filming and sending in an audition tape for the TCN-9 executives. He was given the host's chair for six weeks. He planned to base his version of the show on Johnny Carson's Tonight Show. Lane's run was variously referred to as The Tonight Show, Tonight with Don Lane and Sydney Tonight. Within a month, Nine settled on Lane as permanent host. After four weeks, his original six-week contract was extended to forty weeks.  Tonight with Don Lane featured comedy sketches, interviews with visiting entertainers and musical numbers often performed by Lane with the Tonight Show Orchestra. The announcer for the show was Mike Walsh, who later went on to host his own successful variety show.  Due to technical restrictions, Lane's tonight show was only broadcast throughout New South Wales, just as In Melbourne Tonight(IMT) was restricted to Victoria. Work on a coaxial cable linking Melbourne with Sydney had begun in June 1959 and was completed on 5 February 1963. On 7 July 1965, Lane appeared on a then-innovative live split-screen link with Graham Kennedy via the cable. Lane and Kennedy sang the song "Seventy-Six Trombones" as a duet. They took full advantage of the new technology and the duet included the performers throwing jugs of water and Kennedy holding up a sign saying "Go Home Yank", to which Lane laughed. Lane also performed another duet with Kennedy at the Logies ceremony in 1967.  In March 1968, Lane was charged with importing marijuana into Australia. He was arrested at Sydney Airport and remanded in custody. He strenuously protested his innocence, claiming that the drugs were planted into his jacket pocket by a former business associate who wanted revenge. He was found not guilty on all charges, being defended by barrister Marcus Einfeld.
Did he have a co host?
A:
The announcer for the show was Mike Walsh,