Not sure if there's an official term for it. I call them droopy flippers. Everyone is correct about them making center shots more difficult. I've played several MMRs, all of them droopy. Playtested one fresh off the line at Stern, and the only thing that kept me from BFTK was castle crusher. Literally impossible to hit on the fly, and an even a trap was no gimme. Imagine you're trying to backhand a ramp, and you can hit the castle.
Corrected the flipper angle immediately after unboxing my MMR, but I've never had even close to a great game on it. Dunno if there's something magical about the one I played at Stern, or if I just played a fluke great game, or what. All I know is my scores are about 2-3 times higher on original MMs, even fast-playing restored ones with freshly cleared playfields.
I recall @pinwizj's MMR absolutely destroying our group in league. Even @JPW remarked that something felt... off. And it's definitely not his first rodeo.