Finaly Fantasy 7: my bro and I raced through it on separate save files to see who could beat it first. He won, by quite a way.
FF8: Got bored halfway through, haven't played a FF game since.
S.T.A.L.K.E.R: Shadow of Chernobyl: - Got ridiculously wtf owned in the first mission countless time - it's just such a hard game for me to master (and I suck at FPS to begin with). Got sick of it and left it. Might give it another bash over summer.
Empire Earth + Expansion: God awful games, campaigns were FAR too difficult after the first missions, poorly executed tech trees, and the god awful voice acting. Plus, the way the AI would 'conveniently' advance to the same age as you, if you overtook them, in skirmishes. Sack that.
Dead Space: Borrowed it off a friend, really wanted to finish it but had to give it back (PS3 version). Will definitely finish it one day!