2 and 3 are great games, 3 is the best imo
The Liberation DLC has been preserved (both US and EU variants), have a look in the PSP uploads section.
I think mega(?) might have posted something a while back saying it looks crappy on last gen, and I know it has heaps of issues on PC...so it might be a title to grab for current gen (I'm not sure if you have a PS4 yet or not ).
Edit:
Or maybe it was Shadow of Mordor that mega was talking about?...anyway, some PS3 versions are noticeably worse looking while others aren't so bad. Far Cry 4 isn't a vast difference, and over here (at least) the PS3 version is cheaper.