Every character is different enough for it to not really matter at the moment. Animations become irrelevant later on because when you play a move is a move....whether someone is flying at you butt-first while holding a giant key or throwing bright lasers in your face, come game-time all you care about are the move properties.
If you want more diverse and fun combos, then play GG or something. The combos in MB still serve their purpose as combos (provided you don't fuck them up). Even then, the diversity in MB combos is still not absent or particularly lacking; sacchin arms, arc wallslam loops, midscreen relaunches, and 5cc ninjashit, miyako wallslam combos and dash-elbow extenders, particularly cool stuff like akiha 2c loops; the list goes on. While it isn't as crazyweird as GGAC in combo shenanigans, it -is- better than most fighters, and its something I personally appreciate a whole lot more than cr.MK super. Be grateful.
As for moves that are similar/identical, they're really not enough. To use Kyrie's example, although sion and v.sion 5a,5b,2a,and 2b look identical, only 5a and 2a are functionally the same and for the most part all the 5a's and 2a's in the game are functionally the same. Their 5b's and 2b's have the big difference of one being neutral on block and the other being unsafe which does a lot for V.Sion's rushdown game. Even their 6b's, one is chargeable and the other not, but the bigger difference is how much invincibility they have; one has (more?) lower body invincibility. Their j.C? V.Sion's is superior in range despite having the same animation. Even their 3b, again, Sion needs it for all of her combos and V.Sion can pull off combos for every situation without it (actually usually better to NOT use 3b, for throws there are other options like 2b5b and for CH you can do those cool 6b groundbounce shenanigans)
This isn't just for these two, either. Akiha and V.Akiha are arguably the most similar characters, yet play more than significantly different from each other because of movement differences.
tl;dr: No one gives a shit about animations and disregarding those the game has more than sufficient variety and diversity