It's not going to be winning any awards, but it's an entertaining gameplay experience packaged alongside a virtual vault of nostalgia, and worth at least a glance for fans of the genre or the characters.
Unfortunately, it runs on the same engine and is built on nearly the same game design as the last two TMNT games, which were less than spectacular to begin with... At full price, it would be hard to recommend Mutant Melee to anyone.
Monotony does not a good game make, in any situation. In a brawling game, it's practically a death knell, a sign of laziness in development and a lack of innovation. And it's one of the key things that kills Mutant Melee before it can even get started.
What gets under your skin is that most of the combos are unblockable, and once you are caught in string of moves, you must wait until the move set is over before you can block or counter attack. This can be frustrating on both A.I. and human battles.
While a fleshed out narrative for each character would be a bit far reaching, what the Adventure mode amounts to is little more than a series of mini-games that are repeated ad nauseam for under an hour per character.