MK9 started at the beginning and introduced everything. To appreciate SFV, you had to already know who everyone was, what they were fighting for, etc. via arcade mode endings of 10+ year old games. Most of the SFV story is fanservice that will fall flat to everyone who hasn't seen the SF3 story enough to recognize the girl Chun Li takes care of, or doesn't remember the existence of the dolls.
MK9 and X also feel like more care was put into choosing characters for the game based on their plot.
SFV is missing so many characters who would be important to the death of Bison and Ryu overcoming the Satsui no Hado. Where's Rose? Where's Evil Ryu for a Ryu vs E.Ryu fight? Where's Akuma?
But they put in Zangief, Mika, Laura first for other reasons, and then had to craft a story mode with the playable characters they already had, whereas MK feel like thought was put into who to include based on the story they were going to tell.
And of course, SFV's loading screens are much worse than MK's seamless FMV to gameplay transitions.
Also, poor use of costumes. Where was Bison's ripped up outfit you can buy after he got blown up? Where was Hot Ryu?
Didn't they say that costume was a part of the story they were going to tell? If Guile was dressed like a cop, why couldn't Chun use her cop outfit?
And the default difficulty is basically non-interactive.