First off, I have no problem with it. Whew, good. That’s out of the way.
I played MM pre-BC, I played BM during BC, and was giddy when MM became a competitive spec for raiding again with the 3.0 patch. I go where the DPS is. Marks is my absolute favorite spec. I love the complexity of it, and how skill-intensive it can be.
I am an end-game progression oriented raider who prefers the 25m format. I will do what has to be done to kill the boss and maintain a high standing in progression stack on my server. As it stands right now, CA is ranked second on the Alliance for progression, and 6th overall on a Horde heavy server. I take a lot of pride in that, and so does my guild.
End game progression raiding isn’t all that’s out there. Casual raiding is perfectly fine. I probably would go casual if real life ever becomes too much for my raiding schedule. Would I ever pick on a BM hunter in a heroic? No way. They can play the way they like. Same thing in a PUG 10m ICC run – they can do what they want. If I were to pick people for 25, and I thought we were able to clear the whole thing? I probably wouldn’t take the BM hunter, just knowing I could get a MM or SV hunter that can push bigger numbers. That’s just me.
Ultimately, WoW is just a game. Play how you want, regardless of how much the GearScore-mis-using people pick on you. It’s your hobby, not theirs. If you want to do end game raiding in BM, go for it. If you want to dress like a purple unicorn and dance on the fountain in Dalaran, go for it. Play for you, not for what other people think you should be doing.
*Edit* Perhaps my point wasn’t 100% made the first time I went through this post. Beastmastery IS raid viable IF you can play it well. It is the easiest rotation to play. If you want to play BM, do it. Just understand that nailing down the solid rotation to hold your own will take time — as with any spec. If you’re chasing DPS, and want to maximize your potential? Think about MM/SV — but if those play styles don’t work for you, go with what you like.