Mortal Kombat 2011's Tag System vs. Tekken Tag 2's Tag System
First I'll discuss on Mortal Kombat's inclusion of Tag Team mode. Unlike the 2 vs. 2 in Mortal Kombat Trilogy and Mortal Kombat 4 where only if you lose one opponent can the second one come in, here you can tag them in and out like in Tekken Tag Tournament. But unlike in Tekken Tag games, you must defeat both opponents in order to win the round or lose two players to lose the round. The opponent usually falls out of the arena when defeated rather than the explode into pieces in MK Trilogy/4. The gameplay involves the use of dial-in plus mash in Tag Combos and Tag Assists (which take one level of the Super Bar). In here, you can try to figure out what team will make one powerful team like my favorite is Liu Kang/Kung Lao, Baraka/Mileena, Cyrax/Sektor and Kabal/Stryker. Too bad though the intro/outro doesn't follow Tekken Tag 2's style.
Tekken Tag 2 follows the Tekken Tag 1 system where if you lose one character, you forfeit the match or defeat one character, you win the match. It only takes one character to be out of the tag to win or lose the round. I just thought it's a nice challenge though I prefer the whole must beat two to win. But still nice in a way. Tekken Tag 2 features tag combos, tag throw (really neat feature) and tag assault to which really adds a nice meaning to Tag Team play.
Just my two cents!