1. Saying that my statement is false is false on your part.
2. You're being a prick.
3. I've read all of the posts in this thread.
4. Unpredictability is a thing. Genesect, by virtue of its varied movepool, is pretty much guaranteed a KO on something on your team because you won't know what it is running. Usually, I see special Genesect, so I switch in Blissey when I see someone leading with it. One iron head later, I THINK I know what Genesect is running, so I send in Skarmory. One thunderbolt later, I know it's running a mixed, non-choice attacking set. If I don't switch, it has access to enough attack power to kill pretty much everything I've ever used as a lead in one or two turns.
5. There are no solid counters to it. Talonflame's Flare Blitz doesn't get priority, and Genesect can easily ohko with almost anything it has in its toolkit. Aegislash can check it if you out-predict, but you'll still lose since Genesect can just flamethrower you. Blaziken outspeeds after one turn, and can OHKO Genesect, but Genesect can Extremespeed Blaziken and likely KO after rocks or leave it in the red. Chansey can tank both physical and special Genesect, but can only Seismic Toss or Thunder Wave it, due to Chansey's horrid Sp.A and Genesect's Toxic immunity. Blissey can OHKO special Genesect but will never outspeed outside of Trick Room, and will probably be OHKO'd by Iron Head or Extremespeed. Skarmory walls physical variants but is usually 2-hit-KO'd by mixed and special variants. Gliscor might be able to wall it but can't really do anything to it in return, since it isn't weak to EQ. I can go on and on.