I could share mine, but I can say it wouldn't be as negative as Baby Luigi's.
I like Galaxy 2. It's a good game, but the first one beats it by a long shot. First of all, Galaxy 2 lacked the feeling of exploring far off, alien worlds. That might be mainly because they regularly used the sky background, but the levels are too... casual. There's nothing that special about most of them, and the ones that are special either have a clone galaxy or are more gimmicky than enjoyable. Galaxy 1's levels were all dinstinct, and most importantly really felt like a trip to outer space to me, and were special in a way (except Golden Leaf Galaxy, that shit can go fuck itself, even though the second mission is pretty nice).
Yoshi was a cool addition, but it didn't really make the game feel different, if anything it brought it closer to the other games. Yoshi being in there does not automatically make the game better, and the cutscenes were way less impressing or climatic. The final Bowser fight is, but it's basically "Ground pound a few times and you're good".
I mean, I like it, again, it's a good game, but Galaxy 1 is just way better, I mean it's my all-time favorite video game for a reson.