I agree the crouch grenade is one of the worst in the game but there will be setups in which you can combo it will mollies in the future I imagine.
the ult is actually decent though as if you use it correctly and not like a bot, you basically get a free kill
Sound trips are very good as you can be so creative in trap setups and I think you just haven't played against someone who knows how to use the trips. You can put two trips on a chokepoint and if they walk through then jiggle peak them or whatever so then they shoot you and make noise and then they get stunned if they decide to just shift past them when ur defending. She is super strong on maps like bind where there is only 4 chokepoints.
Barrier wall is pretty op especially in lower ranks as it takes so many bullets to break and can be so good in 2v2's and below but if you just all spam a few bullets on the centre and break it then the barrier is gone but if your down numbers then you can just respect the wall and go around it or just break it as im sure 30 bullets isn't that bad