My thoughts are that you are in the minority. On most points, but certainly when you say he's ruining wrestling.
First off, is there anyone on the roster with the credentials, ability and appearance of Lesnar. As in, is there a NCAA, WWE, UFC and IWGP heavyweight champion in pro wrestling history, with ridiculous agility and strength and technical ability and the looks of a caucasian Incredible Hulk other than Lesnar? Because I'd say a guy with all of that was a once in a lifetime find. And let's no forget that Lesnar's reputation isn't just from outside sources; he was a pretty dominant fellow in his first WWE run too. His reputation as a star attraction isn't based on his current work, it's based on what he has done and accomplished previously.
Now, on the suplex point, yes it does get repetative. So was most of Hogans matches. And Flairs. But the formula worked even though it was mostly the same deal. Lesnars deal is he suplexes his opponents to death with a move he has perfected. (also, Lesnar isn't the only one to abuse the German suplex. I remember some matches with both Angle and Benoit where they'd hit ridiculous amounts of German Suplexes. Not just one guy on the roster doing it, but two simultaneously) Now while we see it whenever Lesnar shows up, we don't see it every week and not only does he do it to the lower card guys, he did it to Cena; the biggest star of the last 10 years. Also, Angle has been so guilty of doing the same thing with the Ankle lock in the past. Maybe not quite to the extent as Lesnar but he sure isn't innocent.
Looking more at him and Angle (as that seems to be the popular comparison) Kurt Angle is the only guy remotely comparable, but Angle's a different beast. He was born to be a pro wrestler, where as Lesnar was born to be whatever the hell he wants to be. People pay to see him because not only is he a beast, but he isn't around that often. Angle has for virtually all of his career been a more regular worker, giving him way more exposure than Lesnar, and is labelled as a technical suplex/submission master. Lesnar on the other hand is few-times-a-year physical freak; when you see someone move as quickly as him at his size and then proceed to destroy people, be they Bo Dallas or John Cena, it feels like an event. Kinda like Hogan going round and Hulking up to beat virtually everyone. Is it a predictable formula? Of course. But it's one that works, and if you're honest, you're waiting to see who is going to break the formula and get one hell of a rub by slaying the beast once and for all.
And lets not forget that when they did the suplex gimmick for the first time, it was against Cena and it garnered Lesnar a babyface pop because of the shock of how much he dominated. IF WWE have got a winning formula, they are going to stick with it. They're doing the same with Heyman, and I'll fight you on this one; since he's been back Heyman has put in serious 'Best Promo Ever' contenders and been the most consistent microphone performer on the entire roster.
You can say it's boring, predictable and a waste for all involved and watching when Lesnar rag-dolls someone around the ring and that isn't an issue. To be honest, it does get hard to argue those points. But to say it's ruining wrestling? As in all of wrestling? That's a bit silly and a case of overstating your personal feelings of disliking Lesnars character and status.
Hey, I'm just sayin'.