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I don't see then how progression is ruined. If anything it sounds much more flexible than before. I remembered the shytty days of Molten Bore and trying but failing to get through Naxx when raiding was at its most inflexible.

I agree, it is way more flexible. Vanilla raiding was terrible.

There were however, a few elements of Wrath that I didn't like. Things felt too easy. I never had to use crowd control, EVER. From what beta players of Cataclysm say, you need to learn how to use crowd control and kiting again.