Good Game for the MW crowd...rehash for old school CoD players
The biggest issue I have with all of the modern incarnations of COD is that all the games are basically run and gun with small maps. There is very little team work and most of the kills are basically at pointblank range. There is also a lot of camping which is also pretty lame.
If you are fan of the CoD series, buy it you will enjoy it. I dont think it has as much polish as MW2 and most people I encounter feel the same, probably because its done by the other studio.
If you are a FPS fan and actually prefer tactics, better graphics and more realistic firearms go with Battlefield: Bad Company 2.