But... butt... fire! BUTT-FIRE!
[edit for relevance]
Now playing Medal of Honor: Warfighter.
TL;DR much, much, much better than Medal of Honor 2010
Got it for half off because I'm Battlefield 3 premium, figured why not, it's actually really fun once you get into it. It will take you 2 hours to get used to the mouse acceleration, weapons handling, buddy system, ect. and you will die a shit-ton.
Won't say anything about the campaign, because I only did the first 2 missions, although general consensus is that it's much better than BF3's. That's like saying it's better than terrible though, so take that as it is.
Instead of squads of 4 like in BF3 you are in pairs. Buddies can spawn on eachother, and heal eachother by holding down E on your bro for about one second. Once the bar fills you have healed him and refilled his ammo. Pretty cool mechanic, doesn't take long, but long enough to prevent abuse of it. Weapon handling is also very different from BF3. There is more vertical recoil to the weapons in addition to the spread, a welcome change in my opinion. It's getting compared to CoD a lot, but IMO it's more of a middle-ground between CoD and BF3.
There are 72(!!!) soldiers (essentially classes, compared to 4 in BF3 and 5+5 custom in CoD) and the weapon customization is pretty deep. Guns have stats and parts change those stats, everything from barrels to stocks to receivers can be unlocked and swapped out and affect the weapons statistics.
It also has "seasons" similar to some strategy games, where players are divided by nation and nations are ranked. Nothing game changing, obviously large nations like the US and Russia are at an advantage, but it's always fun to root for the home team.
Downsides include a range of glitches and bugs, so if those things annoy you, i'd wait a while for some patches to roll out.
All in all I would only recommend this to people who either enjoyed the previous MoH, enjoyed both CoD4 and BF3, are BF3 premium and will only have to pay $30 for a distraction until the new expansion launches, or people who enjoy objective-based modern-themed multiplayer FPS a whole bunch.
Screenie of the classes, and the few I unlocked after about 2 hours of playing.