With widely publicized raid strategies, known 3.3.5 optimal raid compositions, 3.3.5 talents, and a server that likely has a much smaller % of casual, lesser-skilled players than Live does, I think it was inevitable that they had to buff the raids. Assuming it's a bit overtuned, here's the key: if the majority of 10 and 25 man raids that are FULLY geared in heroics/reputation gear are still able to clear the entire raid, then there's nothing wrong with it. I think most players would prefer that the raids will require pre-gearing before they're tackled. Someone has already stated that the gear available on the PTR right now is not quite on par with full heroic and rep gear.
If people think it should be beatable shortly after hitting level 70 with random greens and blues then I don't understand what's the point of playing here. Those people are just going to clear the raid a few times, get their gear, and then disappear for weeks until the next raid pops up and rinse/repeat. Then, once they've done the same in ICC, they'll be the first people to quit the server after the Lich King is dead. Honestly, I don't see why they should cater their programming decisions to that type of player. I appreciate that they're trying to make every tier harder/more enjoyable.

