I for one would like to see a lot less shuffles on servers. Why? Well just because votes comes up a lot when it does no good or makes the game annoying. For example, axis and allies has almost the exact amount of XP on each side, it’s tough to progress for allies but the game is fair (always been easier to defend than attack). What will a shuffle do here? Absolutely nothing. It seems as soon as one side has a hard time to progres they vote for a shuffle instead of trying harder to overcome the obstacles.
Also a lot of times a shuffle is sugested when there’s only just a few minutes left of the game, so a shuffle will restart the map all over instead of just finishing the map, change to a new one and issue a shuffle at the start of the round. If I played a map for 20 minutes I don’t want to start all over again.
There are situations where a shuffle is a good thing to do, but the number of votes raised for a shuffle nowdays are just silly.

As RocketGrrl says, a lot of times I too will jump to the weaker team and try to turn the tide of a game. It can be very satisfying to help a weaker team out enough to win. At least this way I make the decision to change sides and it is not left up to some n00b that can’t shoot straight.