>>18162483>only a single good resistance to Grass and Bug's two or more>no strong STAB since Psychic>doesn't hit anything important for SE damage>one of the few types that combos poorly with Steel, together with Ice and RockIt's definitely worse than Grass at this point, and Bug has better dual-types, moves, and coverage.
Plus Dark and Ghost got buffed, and the other types that can hit Fighting or Poison have much better coverage overall.
As for OP, I'd say Tyranitar has a pretty decent fanbase, at least for such a standard Smogon staple. Probably because it isn't going to destroy your team until the game's already half over, thanks to its shit defensive typing and speed, and how sand only has like three abusers who are all easier to hate than Rockzilla.