I have fought AST in Seal Rocks and they so do need a bloody nerf... I hate hitting with "0" damage on them when they have that shield up. And some videos to show how "awesome" they are at surviving, tanking, distraction, and using the terrain to their advantage to make them nearly unbeatable:

https://www.youtube.com/watch?v=MdgdMFw6Hpk

https://www.youtube.com/watch?v=8SQKyksNipk

https://www.youtube.com/watch?v=Uagwim949jA

Ignoring the first video's... choice of music... you see so many guys targeting a single AST and they do not go down. True the AST did go down in the end, but a single AST can seriously screw up other teams if they use their healing abilities and terrain to their advantage, no other class can do this.

Tell me how this is not broken or overpowered in the slightest? Should a single class REALLY be able to tank some many attacks like that? Though this player did have very good teamwork and communication skills here, but damn.