Sentinels win. They have the combined powers of a ton of other mutants, aren't magnetic like their past selves, and are way faster/more agile/strong. They overwhelm him.
Agreed, he was an absolute monster. I just don't think he has the focus/control to keep an eye on all twenty of them moving like ants around the stadium. He would get a good amount of them, but once they close the gap it would be over. Think about how close Wolverine got to him while sprinting right at him. Imagine twenty Sentinels doing the same thing at the same time, except faster and crawling/parkouring around.
Yea I guess those guys were a little OP on their own. That wolverine scene pissed me off, but Mag got him good and really good. Now we know how wolverine can be taken out. He disposed of him like a rag doll.
Sentinels stomp. Older and more experienced Mags had to rely on a haxed strategy(overloading the reactor of the X-ship) to destroy a few of them. Future sentinels are far too powerful for any single mutant to take on by themselves.