>>15913734He's a lot of fun once you learn how to use him, but his performance is based on how well you predict your opponent. You can let an idiot when if you overestimate him, and the inverse is also true.
That said he has a lot of safe switch-in opportunities, and his new weaknesses are almost a blessing when using Weakness Policy, which either reduces your 3-turn setup to 2 turns or bypasses it altogether depending on the situation.
I can tell that you will never meet a Tyranitar online that won't try to Crunch you and then eat a Sacred Sword OHKO.