I recently had a chance to see a raid video of Blackwing Lair, by A Few Good Men. I have always liked Blackwing Lair, and consider it to be one of my favorite instances.
However, on watching the video, what struck me was the Blackwing Lair fights look really boring, at least compared to modern fights. Everyone pretty much just stands in one spot and spams DPS or heals. The only fights that look mildly interesting are Razorgore and Nefarian.
Admittedly, part of it is that a lot of the challenge in BWL dealt with tank threat (Vael, Broodlord, Ebonroc) and Line of Sight (Firemaw, Chromaggus) which was important in the days before Omen and that is something that is something that videos don't convey well.
Is it just nostalgia that tints our view of old fights? Is it hard to appreciate just how unique and interesting modern fights are?
Even Trial of the Crusader, for all that instance is denigrated, had far more complex fights than BWL. Take a look at Northrend Beasts, with its three phases, snobolds, multiple wyrms, poisons that cancelled each other, evading charging yetis, etc. That's significantly more complex than even Nefarian was.
Revisiting Blackwing Lair has certainly made me appreciate modern raid fights more, especially those in Icecrown Citadel.