@Vorbicon: Yes. Infiltrators are so awesome in Mass Effect 2. The only thing that sucks about them is that sometimes (only sometimes, mind) your squadmates are TOO competent and you don't get as many headshots as you'd like, plus ammo is a little more limited. ME3 fixed that problem with more enemies and ammo drops in general, plus mods to increase carrying capacity... ^^^
@Fenrif: I'll have to respectfully disagree that galaxy scanning is more boring than mining. Fully seven to eight hours, if you're trying to get all the upgrades, is devoted to going around and mining planets. I can scan a galaxy, get everything, dodge the reapers, and be out in like four to five minutes (assuming the galaxy has three things in it to grab, of course; time depends on how much I'm looking for). Also considering that almost everything to find is a war asset and therefore doesn't really matter anyway since EMS only determines which 'ending' you get, you can safely ignore them if you don't feel like doing it, whereas in ME2 you HAVE to go mining to get better weaponry, especially on the harder difficulties.
@Darkmere: Indeed. I like Vega better than Jacob, but after playing through the Alenko romance in ME3 I'd have to say I actually like him a lot better than I used to. I'm not sure about 'too many' squadmates, though. My only complaint there is that you're not given a choice of when to recruit them. As NobodyPro pointed out with the ghost-files and as a certain YouTube video shows (I don't remember what the link/name of it is, but it shows every squadmate response to being told to protect Garrus), you should have been allowed to recruit anyone at any point. I like to pick a pair from the start and use exclusively them for the whole game, and it would be fun to take, say, Tali and Jacob on one run to see how they interact, then in the next Tali and Jack to see if the squad chatter changes any, and so on. :\ Why can't I take Tali and Legion and let them argue the entire game? That would be pretty entertaining. (Oh, that reminds me. This time through ME2 I need to hold off on activating Legion until after I beat the game and then do Tali's Loyalty quest with him to see if the Admiral's reaction to him changes in ME3.)
I pretty much always used Miranda though because her class ability makes Shepard stronger. XD
@NobodyPro: I'm right there with you. Why the hell can't I ask Jack to follow me again? I liked her. D: