Number of Players

[offsides]

I'll agree with Andrew that more than 7 players makes the game take a long time waiting for everyone to go, but if you have a good group then it can also be a lot of fun. One of my favorite games was 11 (or was it 13?) people, with 3 level 9 clerics tying for the win when Divine Intervention was drawn.

Of course, the game took like 2-3 hours, but it was fun...