I'm reviewing these games together as they were released within 4-5 months of each other and as I see it, are direct competitors for the FPS market. Plus I own them both, so a direct comparison is the best way for me to approach them. I'm currently online Lvl 37, 200+hrs on BC2 and Lvl 38, 30+hrs on MW2.
Just to confirm, I am personally biased towards Bad Company. It was the first out of the 2 I owned and it suits my playing style better. However, I will do my best to give an unbiased review (bar the 'gamestyle' review, sorry for that) and comparison as I see it. I am basing my review on the online experience through PSN, without DLC or perk effects.
Explosive Effects
MW2 appears more 'Hollywood' in its rendering and effectiveness of explosives. Explosives in MW2 do more damge to 'you' than in BC2, but leave the environment, barring windows and explosive objects such as cars and barrels, intact and standing.
BC2 has more 'actual' effects on surroundings thanks to its fully destructable environment. In BC2 you can actually knock buildings down, blast away walls and shred undergrowth in a progressive manner, ie: C4 on structural walls will bring a house down. On non-structural walls, they'll just destroy the walls but the house will still stand.
Player Movement
MW2 has more 'realistic' movement, your player tires after running and slows to a jog. Weapons seem heavier and are relative, ie: you can run for longer armed with a pistol or SMG, than with a Stinger Missile or Shotgun. The fact that you can 'run' indefinitely in BC2 can however be justified by the larger maps available but does detract from the realism.
In MW2 you can go into the prone position, something BC2 noticeably lacks and can be most irritating at times, especially if you are used to MW2. Sensitivity adjustment is comparable in both. Player directional control, although relative to the correct settings for the player, is also smooth and tactile in both.
BC2 Vehicles
In BC2, all vehicles are freely available to all players and are usually located in, or close to, the main bases or spawn sites. Depending on the map, different vehicles are available. From Heavy Tanks and Attack Helicopters, to Smaller Tracked vehicles, All-Purpose mini-gun bearing Helicopters, HumVees and similar 4WD type 'cars' with mounted machine guns to Boats with mounted weapons. For a more personalized form of transportation, you can choose from Jetski's and Quadbikes. Unarmed but ideal for 'rushing' the enemy and getting up close and personal, in as fast a time as possible from re-spawning at base camp.
Hosting vs Dedicated Servers
Unfortunately this is MW2's biggest failing. BC2 uses dedicated servers to ensure a smoother and more reliable online experience. MW2 relies on a hosting format, which, if the 'host' player drops out or suffers a connection glitch, means at best, gameplay is interrupted, at worst, the match simply ends. To make the most of MW2 and to overcome 'some' of the problems, ensure you have a good reliable connection, preferably hardwired and invest in the best broadband speeds you can justify. This will overcome some of the 'lag' problems many suffer from. This isn't to say BC2 is perfect, it isn't. There are occasional dropouts and inexplicable difficulties in initial connection and some lag at peak times but on the whole, these happen far less frequently and intrusively than on MW2.
Summary
Overall, it is dependant on your initial ability, own playing style and commitment to the game in question, that will determine which game is more enjoyable for you. There are too many pro's and not enough con's in both games to determine which is best. I happen to prefer BC2 but I recommend you buy or at least hire both if you are interested 'in the dark side', whichever that may be. But for FPS fans, I can wholeheartedly and highly recommend that both games should be part of your collection.
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