Orianna any good?

She's one of the best scaling mid laners in the game, has very little in the way of strong counters, and provides amazing control and teamfight.

Ori is always a good pick so yea, buy her

"Is she good" really vague useless question.

I suggest trying out free rotation champs or signing up for a PBE account

If your are good at ori then shes unstoppalbe but thats if your good

Theres a reason why Ori always make an appearance at worlds , she has probably the best ultimate in the game , shes safe , she scales super well. Shes just a really great champion to have + I find her really fun to play.