I agree about the weapon compare thing, it can be a little annoying.
Other than that i'm having a blast with Borderlands 2, i think it's of the best games i've played this year and i just picked it up because i never tried the first one.
if you tried the first one, i guess it's nothing new...
Controls are ok, i can live with them once you get used to it. Settings for Graphics and so on are great imo.
You can buy upgrades that makes your inventory bigger, and usually there's vending machines everywhere you go so i'm almost never having space issues.
Checkpoints are not a big issue for me, there's pleny of save stations and you can always just run back to 1 if you wanna stop playing.
usually i hate not having a save option everywhere, but i don't think it's a deal breaker here.
i you wanna bash bad pc ports, i would say there's plenty of worse examples out there