Good point akeley, and maybe I'm approaching this all wrong. Part of my problem is that I tend to be a bit of an "all or nothing" kind of guy, so if I'm playing a game to get a high score then I'll put a lot of effort into that endeavour, even if I'm not particularly enjoying it. I guess I'm guilty of not applying rule 5 and letting my competitive spirit get the better of me, rather than sticking to the fun part of it.
This also made me think, and you're right. If I don't like the game then it'll only take a few minutes to get a basic score and then I can focus my efforts on the games I do enjoy.
So thanks guys, you've made me reconsider and I'll still join in. But enough of my nonsense - I'm sorry to have slightly derailed this thread, so let's get some scores posted!