Tournament doesn't necessarily mean best of the best... just missing the deadline could eliminate you regardless of spriting skill. I'd think it was more a test of persistence/creativity in that regard. :/
Critique is one thing, but out right saying "this is a recolor/frankensprite, ur a terrible person this is terrible" isn't critique. :/ There's always something constructive to be said, and frankensprites are no exception. Just the way the pieces are put together could be commented on. ie: "His colorscheme matches well..." " I can see you wanted to give the impression of royalty with this combination." Entering contests is a good place to learn about your style, what others are doing around you, and can be a more fun and interesting way of getting your work out there/growing. Not everyone gets what they need out of "is my sprite suck/improve my art" threads :/
If the frankensprites were so terrible/not allowed they probably wouldn't have been uploaded in the first place.
If you didn't want the frankensprites to win, all you'd have to do is not vote for them. That's the miracle of voting. But demanding an artistic mandate is kinda cruel. Especially after everyone had submitted their entries. Discussion could have been had between the qualifier and the first round, and like was mentioned before, if new rules like "no frankensprites" were necessary it could have been worked out then. >.<
Finally, as an artist myself, I want to say that when you enter a contest or participate in anything subjectivity based, you should have confidence enough in your own skill to let it stand on its own. You shouldn't have to use words or complaints to bring others down. Not that I believe heavily in such things but things have a way of working things out. :/