My feelings might be swayed because I loved the original *Trainspotting* movie and also found its book to be a standout, even if it was sometimes difficult. I’m going to try not to reveal anything about what happens, since doing so could spoil some of the humor for people who haven't seen it yet. Please forgive my lack of specifics; I think you might understand why withholding details is important once you’ve watched it—it’s a matter of enjoyment, not surprises. The biggest disappointment is that it isn’t called "Porno," because that segment was incredibly funny, even the reason behind its name. However, the main appeal lies with the actors. *Trainspotting* was one of those projects where it seemed impossible to adapt a book into a watchable movie, and while “Porno” might have been simpler to film, it would still have presented that challenge. So, perhaps it’s fortunate that *T2* didn't stick closely to the source material. Ultimately, the pleasure comes from seeing the cast reunited; their chemistry is still present, and it’s definitely a group effort—that was also what made the first film so appealing. I won’t describe the story, but the actors really click together; they clearly understand their roles and embody them completely. And the characters themselves are fun to watch. It seems like they could have given those performers almost any script, as long as the cast and characters remained consistent—and the result would likely still be enjoyable. While it isn’t quite as impactful as the first film, time has passed, and it's still...remarkable. Really, you’re watching it for the actors and their roles, and that delivers a lot of entertainment value.

Source on TMDB