Flop play is possibly the biggest factor in success or failure at limit hold 'em. Because five-sevenths of each player's hand is now known, all the remaining action is greatly influenced by what came on the flop. Preflop monsters like pocket kings or AKs can become huge underdogs with the wrong flop. Conversely, unassuming hands like small pocket pairs and suited connectors can turn into huge favorites.
Along with judging how your hand fits with the flop, always keep in mind the texture of the flop.