Ummm... there's lots of people in love in strange directions, and at the end, noone marries the person they fell in love, but they all marry people they fall in love with later, and everybody is happy except the guy who was locked up for wearing funny socks. There's your plot summary.
That being out of the way, I didn't like this play that much. A great deal of it was wrapped up following around the two drunkards, who were not much fun (roguish maid-in-waiting on the other hand? Fun, definitely fun). Noone seemed to really have a good reason for falling in love with who they did at the end. Ironically, actually, the only moment I felt real emotion was when the lady falls in love with the mesenger who is a woman dressed as a man. Her description of falling in love felt real and sweet. Of course, she later is able to transfer that love to the messenger's brother for the simple reason that the two look somewhat similar, which kind of ruined it, but still, the lines were sweet:
Even so quickly may one catch the plague?
Methinks I feel this youth's perfections
With an invisible and subtle stealth
To creep in at mine eyes.
Otherwise, the whole scene where Malvolio dresses up in yellow and cross garters and smiles as wide as possible in order to seduce Olivia was right hilarious, no question. Honestly, I kind of got the feeling that the rest of the story was an excuse for the Malvolio stuff. :P. But, I DID learn where the whole line about "Some men are born great" etc came from, and that it was actually sarcastic, here, which was a charming little revelation. All in all, not my favorite play. But it could be fun if staged well.