Again, not sure there's a problem with this encounter, but thought I'd start a thread to capture feedback.
Visath the frightened was/is tough because of the adds and the time to catch them before they get to Visath and kill him.
When I did the encounter with 12, I had a warrior and pally - but no clicky AE agro items.
The time to gather the adds before they get to Visath is minimal and with the mem blur, it makes things like rampage or whirlwind not very useful as they didn't refresh fast enough. I think the pally had a similiar problem.
Doing it with T8 agro clickies (technically after you've meant to move on from the encounter) made it doable. Having an SK also made it a lot easier. Given it's place in the tier structure - this was doable but I had a lot of failures. Given that sort of pain, I skipped it once I got a couple of key bits and didn't come back. Again, not sure it's an issue, be interesting to hear if others do the encounter often or not.