One thing I noticed about Ulduar compared to ToT is that Ulduar seemed like it had a lot more work put into it through small details like little easter eggs throughout the raid. ToT is just basically the same theme of an Asian palace throughout the entire raid with copy and pasted objects throughout. Ulduar would have little broken columns and floors, random plants growing somewhere, just small little touches like that to make to add more flavor, if that makes any sense. And the area would change drastically as you went further into Ulduar, you really got a sense that each area was meant for each specific boss, a lot more than ToT. It just seemed like overall due to these things a lot more work went into it. The same work might have gone into both, but ToT was definitely missing stuff like that, the stuff that made Ulduar so great. Plus heroic boss trigger mechanics, why oh why did they do away with those? They were such an amazing and immersive idea.