Even though 50/50s and vortexes are 100% more degenerate for a game, it's a lot harder for bad players to comprehend what's happening to them when someone has them in a corner and is mixing them up. They know they're losing, but they see themselves getting hit in melee range by several different moves so they can't really articulate any reasons as to why what they're losing to is "spammy" or "broken."
When scrubs get shot from across the screen by a Jacqui, LK, or Kano, and they can't close the distance to hit their sick combo they've been practicing in Training Mode, they can identify the problem immediately (in this case, fireballs) and immediately start bitching about it.
I was observing King-Worrington cheese his way to one victory after another and I understand why so many people can't handle someone who's got a grasp of the mechanics with a full auto Jacqui.
You can easily duck under Jacqui's machine gun fire without having to block, but not against missiles (thus you can never get too comfortable). Also, you will get hit from the machine gun fire if your character is getting back up after being knocked down. It's invisible to the eyes of the average player, but there's a transitional phase where you are vulnerable to high attacks as you get up and you have to block if someone is throwing a projectile at you. Thus, people are getting mixed up as they never block once they get up even if they found out earlier that they could duck under projectiles without having to take chip damage. They become confused (or should I say mind fucked) and just stand there blocking everything, losing patience and getting destroyed by projectiles.