Pit: Beginner material. He's a swift guy, a lot of his attacks deflect (His special moves at least) and he can fly, which many players do not how to use (The flying similar to Charizard, not his B-Up Flying). I have fun with him time to time, but I tend to abuse B-Right/Left, and I don't like to use him constantly.
Ike: Has a long melee range, proving to be pretty nice. He's strong, but not as slow as Ganondorf, which really gives some great opportunities. His moves take up a lot of space, and a lot of them are REALLY strong. There's a few fast moves you can slot in with Ike, so it doesn't make him very useless. Just be careful when recovering...
Marth: Swift, aggressive, and in the hands of a good player, you should watch out. Give Marth no room. Don't keep your range, there's a special bonus if the tip of the sword hits the player. Now, as Marth, some of the moves prove to be pretty strong, especially at higher percentages. The B-Up for example can kill a player when high enough. :X
And I don't know why I typed this out...I must be bored.