Just the same as it was when I played it as a kid and just as enjoyable. Sure, it only has 9 missions, but they're a decent length and they're all well done. Of course being an old game, it has all the old bugs and animations, however that's part of the nostalgia. Only complaints I have are the bug where pedestrians will sometimes get stuck in their cars on the bridge level, forcing you to restart, and the fact that it's called "HD" which is big fat false advertising. There is absolutely nothing "HD" about it, as all they did was slap an ugly toon shader on and put comic-style effect popups in the game. The textures are the same as they were on the Wii, but made worse. The characters look terrible like someone traced their lines with a thick permanent marker.
The original textures honestly looked way better and I think this game deserves a remaster as opposed to this "HD" crap.