We chose our game like this: The first player draws a card, and the he alone decides whether it's in. Then the next player does the same, and so on, until 10 are out. This way, you can veto cards you hate, without a single person dictating the kingdom. My bf always vetoes Saboteur, i always veto Rebuild. Other cards really depend on mood, for example we are much less likely to have harsh attacks when we are four or more players, just because they make the game last forever. I guess my flop 5 would be Rebuild, Saboteur, Scout, Spy and Scrying Pool. Obviously the balance shifts for less players. At our sessions, Thief is actually decent, and doesn't really need to get vetoed.
Edit: While it's probably obvious, neither of those five is out because they were harsh attacks(Saboteur kind of is). They are just slow and/or unsatisfying to play with.