Ok, but remember that films are subjective and that's just your opinion. It's not universal fact
While Robert was great as the T-1000, I think it's VERY debatable as to whether he was more menacing than Arnie in T1, never mind 'much more'.
I'd have to disagree there.
The soundtrack... While the 80's stuff may not be to everyone's taste, I think the main theme in T1 is way better than the softened up version in T2.
Play those opening credits again.
The general score in T1 is definitely of it's time though, but I think it does a superb job.
Yes, Sarah is more interesting in T2 and she/they did a great job with her progression.
She should be more interesting though after the events of T1 in which she was just a waitress plunged into that situation.
Other than that, we're mainly talking about visual things that relate to a massively higher budget and the advances in FX that were made in the 7 year gap between films.
Don't get me wrong, I do understand why people prefer T2 and that's fine.
T1 just has an edge to it that I don't get from it's glossier sequel that may be technically superior in many aspects, but just isn't for the enjoyment that it provides me in comparison.