Its better than mw2 in some ways. The graphics are better and they cleaned up a lot of stuff so its very pleasing to the eye and easy to read. Creating a class is a little bit more custom which is cool and there's a prestige leaderboard, you can "Gamble" your $ and challenge people and money buys you upgrades on your guns, not experience points.
The gameplay itself is faster. You know where everyone is and the maps are close quarters and smaller. Overall though i'd say it really good, just different pace.