Serious? Ulduar was my favourite instance of all time. That place was crisp and tuned wonderfully. Hard mode Mimiron, Freya, 0 Light Yogg and Algalon were probably the best encounters they ever designed I reckon. TOGC Immortal was pretty freaking cool too - Anub'arak 25 HM required so much precision from every single person in the raid - it's a shame most attempts were ruined by the stupid "PvP" encounter. The only other fight that ever compared before that was Illidan in TBC, and nothing afterwards came close - although Atramedes (sp?) was a very clever design.
Well Hard Mode different story. Like I agree Hard Mode of Ulduar and Anub were a lot more enjoyable. I kind of forgot to consider that - the normal mode mechanics of a lot of the fights I was meh about because they were so easy. I might be biased towards nax because it was my first proper raiding zone.
I will say Anub 25 HM was exceptionally enjoyable but at the same time so stupidly frustrating when people are so retarded and die to spikes etc.
I also was a really big fan of HM PP because that had similar mechanics to Anub in having to avoid shit and then the end when it becomes a DPS race with the slime expanding oh the memories!!!
I guess my argument is I liked Nax as a whole - raids after that had glimpses of enjoyment for me but only a select few bosses.
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