Absolutely amazed at the glowing reviews for this show. Considering how British comedy is generally quite good at pushing the boundaries, it's amazing that this archaic sitcom was ever given the green light.
Gone is the witty writing and subtle one liners that we've come to expect of comedy in recent years, and instead we have canned laughter (seriously, who uses that anymore?), stereotyped characters and a return to cardboard sets. Don't get me wrong, I quite enjoy some of the old classic British sitcoms that used some of these things, however (good) comedy generally move on from that format in the 90s and developed into something a little more, well, realistic. Richard Ayoade's character is particularly attrocious, it's like the writers had so little faith in their own script that they decided to just give him silly hair and a silly voice as an alternative to funny lines and a need to actually convey emotion.
In summary the best way I can think to put it is - if you've seen Extras and thought the sitcom Andy Millman wrote 'When the Whistle Blows' genuinely looked like your cup of tea (i.e. missed the irony), then you'll probably love the IT crowd. If you're looking for something witty rather than gimmicky, best avoid.