I really enjoyed the original PS, even though I mostly sucked at it apart from sniping. Only thing that stopped me playing more was it gave me motion sickness. But modern games seem better at preventing that, so hopefully I can try PS2 when its out. The trailers look good, but I couldn't find any decent gameplay trailers, though I'd imagine gameplay is going to be similar to the original PS with graphical improvements and probably some more MMO type additions thrown in.
Anything with 3 factions gets my vote. Seems this is back in vogue at the moment, with Secret World, Guild Wars 2 and PS2 all being 3 faction.
How far have you got with Mass Effect series? When you get to ME3, make sure to install the Extended Cut free DLC before you get to the ending. Not that this changes the endings in any significant way, but it does at least provide some extra detail and closure to the story.