The first one is obviously much better, but I think T2 has a lot going for it and although it has become fashionable to run it down, I think it does what it does quite well.
It does do what it does very well - unfortunately, some of us don't like what that is. It's not that it's fashionable to run it down (I, for one, disliked it immediately upon seeing it at a pre-release screening), it's that if it's not one's cup of tea, then it's not. And, as polls here have shown, it is a great deal more popular than the original, so again I question the idea that it is "fashionable" to run it down.
First of all, just about all movies built around a kid subtract two stars right away. That means the movie is starting from a HUGE hole, but it manages to climb out of it.
I would have to disagree. You are correct that T2 having 12 year old John as its pivotal character begins at a deficit, but I don't see where it climbs out of that hole. It distracts from that hole with what are truly some spectacular action sequences, and for a moment it takes a short detour into what might have been an interesting movie (the idea of Sarah trying to stop Judgment Day by going after Dyson), but that ends up being used just as an excuse for another action set piece.
T2 has a lot more humor to it than T1, and that's a big part of the reason why a lot of people hate it nowadays, but I think the humor works. Come on, when Arnie shoots the guard in the leg and says, "He'll live!" tell me you didn't laugh.
Yep, that was funny. However, none of the other humor was. T2 has more attempts at humor, but most fall very, very flat - and are also really old robot/ android jokes.
Compared to Terminator, which is an exceedingly tight story with a compact and efficient plot line and themes and a tone which perfectly matches the tale, T2 is bloated, goes down several blind alleyways (is it about John's evolution? the nature of humanity in the Terminator/ Sarah dichotomy? the nature of time/ inevitability of fate in this fictional universe?), and its tone is all over the board. It also drops the ball on several really interesting concepts introduced in the original film - primarily the nature of the future world and the conflict between humans and the machines. Overall, it is a much weaker film for all that it is a successful crowd pleaser due to the aforementioned spectacular action sequences.
But I liked Terminator because it was a very good science fiction story, and I mean in the way of a print science fiction short story. On that level T2 fails miserably - in fact, it doesn't even try to be that. It tries to be a big Hollywood action adventure blockbuster. And it does that very well. However, those are a dime a dozen, forgettable and personally for me, a very unsatisfying movie going experience.