Asphalt: Urban GT 2 is a decent follow up to the original. The game looks nice, it uses more colourful graphics that look better on DS hardware compared to more "realistic" colour schemes of certain DS racing games. The games speed is great, hitting over 300 km/hr feels good. All of the tracks from the original are ported over, plus some new locations. Car customization is fairly standard, but a decent improvement on the original. A complaint I had with the original is how long tournaments and races could go on for. Now races are much faster, and you can save and resume a tournament if you have to turn the system off. Police now chase around the stage, and it can actually be tough avoiding the helicopters. The game's handling is much better than the original. It's looser, faster, and more organic. It's more arcade-y in a good way.
There's one big issue that really squanders any potential this game had: it's so easy. I think I lost 1 race? Just one. Your upgraded car gets so good you can't have any difficulty. I often out-lap my opponents even on max difficulty. Multiplayer may fix the difficulty issue, but there's only multi card play, so you can't try DS download play. If you even could convince someone else to play this. Also, trying to finish the cop mode is annoying. You have to wait out your timer to finish and receive your cash, you can't quit. This can be up to 2 minutes of waiting to continue playing a new mode.
If this game was harder, I'd be giving it a much higher score. Because of how much easier it is than the original, I don't know which one I would recommend more.