Sonic Classic Collection... well then. It's essentially a collection of the four main Sonic games released in the Megadrive era.
I'm not going to review the actual games themselves, we all know how they play, and they are available easily as part of various compilations. The problem is, you can get these compilations and play the games the way they were meant to, via Xbox Live, PSN, and the Sonic/Megadrive collections on PS2/Xbox, etc.
The games play well on the DS. They do their job and by and large are faithful to the originals. This is classic Sonic through and through. The graphics too are pretty much ok. The thing is, these versions of the games are emulated, rather than carbon copies. They have been shoe-horned to fit on the tiny DS screen, and this is evident with frequent scrolling bugs. There are weird scrolling effects on boss fights, because the bosses don't fit onto the screen, and these scrolling effects are present at the start and end of each act. Particularly with the Act summary once you beat it, with all the scores, rings, and collectibles you have amassed, all the information should stay on the centre of the screen, and it actually doesn't. It's a poor implementation of a scrolling system that shows that this was probably rushed out.
There are bugs too, both physical and graphical. In Sonic 1, in the Labyrinth Zone, the Grounders that burst from the floor often end up wandering through walls, while enemies that force Sonic to recoil in pain often end up pushing him behind physical objects such as item boxes and rocks, instead of in front of them. It's a poor show really and blemishes like these really tarnish an otherwise decent product. Oh, and the sub-boss music in Sonic and Knuckles uses the Sonic 3 music rather than the much better Megadrive version of S+K.
Because these games are emulated, you get the feel that much of the cartridge is empty. This should have been used to put in the Master System versions of the Sonic games. Granted, Sonic CD is probably too big, and Sonic 3D wouldn't work too well on the DS, but why not a couple of Game Gear bonuses too? Tails Adventure, perhaps, or possibly even Knuckles Chaotix, a great game that has been strangely absent, and overlooked from every single compilation since its 32x release?
Perhaps I'm being a little greedy asking for more, but the Master System versions at least would be doable and make this worth the original asking price. The games included, however, are classics, despite their slightly shoddy implementation, but they're also all quite easy, and there are no unlockables to earn. Once you've played the lot, there's nothing more to look forward to. Even the cheats don't work, including the famous debug mode in Sonic 1, so could play about in an effective sandbox environment.
Overall, if you liked the original four Megadrive adventures and want a nice portable reminder, by all means get this at its current price (around 10 pounds) but just be aware that this is ALL you get.