As far as 'I need to get my DPS off their tails and push their numbers'? I agree with that. But I'm on a server that's about seven years old (est. March 2006), with our raiding population diminishing badly over the last few years; our best guild is the one 25 man guild on the Hordeside that is 12/12 ToT with 1/12 heroics, and the remaining raiding guilds are 9/12, 5/12 (this is the best Alliance-side guild), and four 3/12s right now, then we get to those of us who just have Jin'rokh down. We've lost two more of our 'heavy' raiding guilds to other servers, and four once-successful guilds have imploded since MOP hit, so pickings of good raiders have been slim and the ones that are left are there due to family and friends connections rather than progression raiding. To wit: 'we don't have enough heavy raiders on the server to be picky or pushy when we're struggling to get 10 some nights to go at all.' Some of us have banded together to lend/loan extras and alts to other guilds at need, but of course, that locks people to someone else's lockout, and alts are rarely as good as mains.
As GM/raid lead, I should be able to push people to get better, but I can't push their buttons for them, and the best I can do is shove gems and enchants and Tankspot/Noxxic/Icyveins posts in their mailboxes, and hope for the best.
I will say one thing, though -- having to carry the weight of a DPS myself and being healed sometimes by healers who rank 11% percentile on WoL has certainly helped me hone my own game... you learn to get a feel for the people DPSing and healing behind you, and adapt -- but it also makes me wince when I run into that bear in LFR that is stacking nothing but Stam and just spamming Maul without even making the attempt to use Savage Defense. Because (I think) I know better.
( I do want to reiterate one thing: I do not claim to be the end and last word on bears. I am very, very, open to critique, criticism, and conflicting advice from folks. The main reason I put together the guide was that I wanted to help out the community and I see myself as a contributor and fellow researcher rather than the authority.)