I think the worst part of control wrestling is that it stalls out the fight and wastes time.
Imagine if somehow point jabbing took 30 seconds off the clock every time you landed a jab, and you could win a round by out-landing your opponent 7-3 with jab strikes. That sounds like an insane example, but that's exactly what's happening with grappling. A small amount of takedowns are stalling out the clock and defining the entire round scoring.
I think both Merab and Khamzat's last fights were boring, and the rules should be changed to take points away from them for control-point-fighting.