Both great games, but COD4 has the edge. It had the better campaign, the multiplayer was pure and balanced and it such a huge step up from previous games.

Never understood those who praise COD4 but hate on MW2.

Thank you! 

I liked MW2 a lot. but never tried de Multiplayer...

Do you know if there 's still people online playing MW2? 

100% sure there are people playing it.

This sums it up. Overall, i'd go for MW2. My most played game of last gen. 

Here's my reasoning.

Call of Duty 4: Modern Warfare is a masterpiece. The story mode is paced nicely, and has multiple defining moments that will stick with anyone who plays it. Infinity Ward didn't have to resort to plot twists, or even much speech, in scenes like the execution and nuke. The multiplayer is almost perfectly balanced and has fantastic map designs.

Call of Duty: Modern Warfare 2's story mode was poorly paced. It does have some moments that stick with players, but then again, it's pretty easy to make the airport scene memorable. The other memorable moments are just plot twists. The multiplayer is simply a mess. A surplus of unbalanced kill streaks were added in. Including the infamous nuke, which gives an automatic win if obtained, meaning game modes aren't being played properly. The juggernaut perk was gotten rid of, but stopping power was kept, making multiplayer unbalanced. Map designs in MW2 are poor, too many different routes, and in some cases too big.

CoD4. One of my favorite games of this gen. You can still find an impressive amount of people playing it on PC. The single player is the best one too.

MW2... It simply had too many things wildly put together, and it felt like a clusterfuck. Someone was talking about it on a CSS match I played recently, was glad I wasn't the one that felt like that.

Edit, and BraveNewWorld just described everything I felt about that game. Thanks!

This. No COD has reached the heights of either since.