Centralized pools push miners out of the bitcoin ecosystem by enslaving them, making them work blindly on their stupid 80 bytes block header templates which point to an unknown set of transactions they have no clue about.
I think calling miners slaves is a little bit excessive. Miners can leave and rejoin the pool at their own willing. They're also free to move on a different pool. As for the block header, that's what they've agreed upon. If you don't like these rulings, you can try solving a block yourself or work for a pool with much less effort.
I also think it's excessive with calling miners slaves. However, today condition force you to choose one of the centralized pools or P2Pool which is barely alive. Solo mining is only possible if you have decent hash rate.