Yes, we know -- level 90s can solo Blackwing Lair's first boss, Razorgore, with ease, but we still think it's an impressive feat for five at-level players. The guild Molten Core Veterans is focused on vanilla-era raiding, with no death knights or monks; no characters above level 60; and no gear or enchants over level 60, either. With the mechanics of the fight -- more about managing adds than damaging the boss -- Razorgore may be one of the only vanilla fights that can be done with such a small at-level group. The next boss, Vaelestraz, takes a lot more DPS to down -- and so a lot more players.
As someone who fought through learning this fight during vanilla, I salute these guys. For all that vanilla raids have gotten easier over the years -- and power creep has even hit players trying their hardest to get the vanilla WoW experience -- the Razorgore fight isn't easy to master.