in theese days information about characters is more valuable than a simple fighting scene, the shorter the better, however aside from a nice fighting scene you also want to know more about characters, fake Fate for a perfect example, even in the game the combat scenes werent all that long, compared to character development it 5 mins vs 3 hours, in those 3 hours you learn a lot bout the character and the need for a fighting scene isn't necessary anymore, in a short fight you can easily determine the ability and skill level of the character, or it's inept ability in some cases, quick judgement and then char info, and you make a final judgement about the character.
Take Shirou for example, in the Fate anime he didn't fight all that much, now play the game, and learn a lot more stuff, hes an amazing character with a huge shitload of a character development on him focused, that alone is enough to make you go play the game and learn at least a lot about him, not to mention the rest of the characters.
Fighting scenes arent as much as needed in such terms.
Guess you haven't seen Dragonball Z, Naruto or Bleach.
6 eps build up and 5 mins ka-boom, quite useless indeed :]