Aside from the failed and superficial fluff, Rampage is the same game as it's predicessors, for better, and much worse.
To judge the game on it's own merits, and not that of it's predicessors, Rampage: Total Destruction feels extremely slow. The controls are fairly clunky, and to smoothly bring down a helicopter, or jump from one building to another feels like a chore. The semi 3D layout makes it hard to position yourself up with a car or a human that you want to pick up. It really makes you think that this game should have either been in full 3D, or traditional 2D. The added depth that the semi 3D would want you to have is that you really can't leave the city block that you're on. The abundance of invisible walls feels really limiting, so it almost makes you feel like you should be able to free roam the city. However, in theory, that would only add to the camera issues, and there are already plenty of those. The buildings are layered, and you can really only see what's facing the screen. The camera will change perspective and follow you, which makes things better, but in two player mode, it will do all sorts of strange things, including the ever frustrating game flaw of not moving if the other player doesn't move with you, something we all thought we were rid of.
For all it's worth, however, Rampage isn't bad at it's core. Had the semi 3D enviornments not horribly backfired as they did, the game would likely be the same sort of action as the older versions, for better and for worse. It's a fun multiplayer experience, for what it's worth, though it's a little too mindless to enjoy on your own. The competitive edge that's been apparent in all of the Rampage games is what makes the repetitive action worth it. Though you'll still be destroying the same buildings over and over is repetitive no matter which way you look at it, trying to do it faster than your buddy makes things a lot more interesting.
For the classification, I put that this game is "All it's cracked up to be." This seems almost too appropriate, since a jazzed up version of an older game is all this is really cracked up to be. The price of $20 seems fair, especially for what it is. Make no mistake, Rampage can be a great deal of mindless fun for two players if you set your expectations accordingly. If you're looking for something a little more fresh, then simply pass this one by.