The playstyle for Sienna and Waystalker still has not changed enough. They can still spam on champion difficulty, making other classes feel obsolete. They kill most of everything, single clanrats and specials. If there is no wave or boss to fight other classes can chose to waste ammo on clanrats to get some action or just follow and do nearly nothing.
A big reason for that is that they can oneshot specials with low cooldown ultis, that even fly out of vision/ range of other weapons. These ultis are just as strong as other bufflike ultis, but have a lower cooldown and require only one buttonpresss to be very effective. A buff, shield, dash or taunt require setup and/or teamplay.
On top of that Waystalkers regeneration passive is too strong. I never thought of it being that strong, but after seeing a Kerillian taking 3k damage on champion, while other players still had 1k average i was shocked. That Kerillian did not take all healing items. At least 1,5k had to be regeneration. Slightly shocked i forgot to take a screenshot, but there will be another oportunity, i am sure.
Waystalker ammo is ok, but healing still really strong. That could stay as her major strength, though. Ulti cooldown might be a bit low, but decreasing timers on other ultis is probably better than nerfing that. Ranged specs should not lose their focus completely and more nerfs to Waystalker would probably hurt the game.
A lot of other changes for the release were very good and bosses are challenging encounters again, which is great.