I'm always keen to start a new game, but when it comes to completing them then I suddenly don't want to know. Though I knew that when I started playing Conkers Bad Fur Day, for example, again that I only would manage so far, as I knew that as soon as I got up to the part with the zombies and the vampires that I wouldn't go anywhere near it again There are many other games too that I've started and only gotten so far, I hate that xD

Yeah, if you have no motivation to play a game then it's pointless, as you just won't enjoy it. Maybe try getting a game that you really really want? or try playing the games online? or having multi players with your friends.