Most of the major developers are afraid of developing mmos that are "different" because they're huge financial investments. Most MMOs that have come out recently have been flops... warhammer, rift, Aion, age of conan (rofl), LOTR... many of these games went free to play because they can't get subscribers. Thus the developers that are around play it safe and toss out generic mmos like GW2, that feels like WoW with a new skin. I despise them anyways, they generally have terrible gameplay that is based on a feeling of accomplishment that you shouldn't get getting from those types of video games. Instead of getting rewards for being skilled, they dumbed it down so all the bads and casuals can get all the rewards. The problem here is that nothing is rewarding, and everything is too easy. Everything in MMOs is handed to you on a silver platter. The only investment required is time.
I also loathe mass pvp. 200vs200 battles? That sounds absolutely terrible. I really don't understand the appeal of battles so large that you play absolutely no part in the outcome. I love small, team based pvp, because you actually matter, as opposed to being just a tiny figure that gets damage / healing channeled into them and dies in .5 seconds. What is the appeal in playing a form of pvp, that no matter what you do, has absolutely no importance? If you leave the game your team might go from a 50% chance to win to 49.8%. Yet for some reason, people keep clamoring to these obscene mob based "battles", where you can literally afk and soak in rewards. What happened to playing games, to, you know, actually play games? What's wrong with playing with 2-3 friends on an arena team where you focus on getting your rating up? Scrubs is what's wrong.
That said, I loved arena in WoW back when it was good, but it's a shadow of its former self because Blizzard has turned into a terrible company that produces mediocre games like Diablo 3.