Only 30% of guilds have cleared the tier on normal due to some of the tuning mistakes that caused excessive roadblocks to progression for more casual guilds. Tuning, plus the falling of three major holidays all landing during the tier severely impacts progression for most guilds, and the normal issues of maintaining rosters all culminated in delaying progression for what is obviously an enormous amount of bosses to try to chew through.
Even if you assume a single boss per week is normal progression rate, which is about right on average for most, that means Blizzard is just barely at the cusp of allowing people a single, flawless shot at seeing sha before 5.2 completely nullifies the tier as content due to the absurd ilvl jump from 5.0 raids and 5.2 starting ilvls.
Regardless of how you feel on the matter, expecting everyone to have managed 2 bosses a week through both normals and heroics just isn't a rational expectation, and the clearance rates for T14 demonstrate that. Which is genuinely odd because they keep posting about how TOC invalidating Ulduar was one of their worst development mistakes, when they're on the verge of doing the exact same thing here.
This is completely idiotic and irrational thinking.
To all those whining about the patch being "too soon," SO WHAT?
So what if it is 2 weeks away? Your guild will still be able to work on normal / heroic mode bosses in tier 14. You can turn the 10% buff off as well. Your guild may not be done with that content, but there are a lot who are.
Just because there is more raid content available, does not mean you HAVE to be doing that content. I'm sorry, but if you haven't cleared normal T14 by now you are a mediocre guild. If you haven't made steady progression in heroic T14 by now, you are not in any way a hardcore progression guild competing for server "first, second, third whatever". You are a mediocre heroic guild so just live with it.
I personally love this tiered raid system. It has some of that Burning Crusade feel, where it will be gating out the less skilled players for awhile until they catch up in their gear level. And with LFR, those bads will be mouth breathing their way into normal Thunder King soon enough (hopefully not too soon though).
TL:DR: Get over it. Bring on T15.
See, I can agree with the idea of just doing the 5.0 stuff even after 5.2 came out. That's what the guild I'm in is going to end up doing.
HOWEVER... It has nothing to do with "skill." Too much of the game revolves around gear. Think that's wrong? Why do they bump up the item level of players in raid testing? But gearing went from being reasonable to being a slow, boring grind on one character, and God help you if you want to play another, or partake in something like Pet Battles. That's where we had problems. Even if we leave our alts to sit around collecting dust, the Valor system is a mess, it requires boring tedious monotony over and over and over until your eyes bleed. Most of us aren't interested in that. Even in dealing with Rage Finder. I tried, for too long. I came to hate the game because it was so mind-numbingly boring. Some people can do that. Others... not so much.
And as for tiered gearing? Ha. My alts will grind BGs for a weekend to get 476 armor, hop into HoF and/or Terrace to get a weapon or two and round up to 480, and be in 5.2 LFR within a week or two of hitting 90, getting better gear than boring dailies and junk will award. So that's my game in the near future: Get alts to 90, BGs for a weekend, handful of 5.0 LFR, and then 5.2 LFR and ignore any further 5.0 content. Which means I'll have roughly as much to do as I did in Cata. Less, really, because there's no new dungeons, and as I won't be unlocking reps for unnecessary gear, I have no reason to run the old dungeons, so I'll end up with just weekly LFR runs for my characters.