I'm all with GoodMagik on this one.
No, I don't really hate MLG, but I have a strong dislike.
Remember: they picked up H:CE and took it up to competitive status good thing. BUT back then, everything was fairly balanced and they accepted that more or less, because they had to - no one really cared about them back then.
Since H2, they suddenly came to think that all the game needs is a BR. Maybe some rockets, a sniper and nades, a camo... But that's it.
And they still have that mentality.
See, they are stalling Halo's evolution. Everyone dislikes H4's new features because they aren't properly implemented. How could they? Until Reach, the community didn't allow for novelties. And Bungie didn't care about Reach and MLG's reaction, that's why it introduced the first concepts of H4's gimmicks.
Had MLG and the community allowed and cooperated with Bungie back then, 343 wouldn't have the trouble of inexperience with AAs and Perks and the whole stuff.
"If it's not BRs only, it's not Halo!"
That's what MLG thinks, I think. And you know why they're back now? Not because the update changed anything (admit it, BR+LR are what DMR was before, even worse), but because their beloved BR is once again one of the most powerful weapons.
Sorry for the lengthy post, but you just can't cut short how MLG sabotated Halo, imo.
Here's the short version, though:
MLG is bad for Halo, because they refuse to accept evolution, because that would mean they had to learn things anew, which would make them look like nubies.