Sadly I'm not surprised by the reviews anywhere, not just on M-A. However just one look at the threads on M-A are evidence that haters get more and more vocal these days. Be it a thread about the new Megadeth album, the new Blind Guardian album, a Pantera tribute tour, it doesn't matter, the results are pretty much always the same. The thread quickly gets populated with people who hate the subject matter. It's not just people who jump in with 'yeah listened to the new song and it's not for me', it's people with comments like ' haven't listened to anything the band has done for 20 years and wont listen to this because it's shit'.
Telling people you don't like something is fine, we all do it from time to time, but to seek out a discussion just to tell people how shit you think the subject matter, and do it every time there is a new response to the thread seems like a pastime of 90% of M-A users.