I keep getting the alert, but even if I try to join a couple minutes after it appears, it makes me warp back out to sector space. Is there a time limit on when you cna join when that alert button appears?
The Tholian ships are stupidly overpowered, they virtually ignore any damage you may do, and they are capable of stupidly high damage themselves. They have repeatedly oneshotted my cruisers.
This is exacerbated by the fact that they have magic abilities that deactivate your shields such that you can't reactivate them with any abilities - not emergency power, not any of the teams, not anything will restore the shields, usually for several minutes at a time (unless they decide to oneshot you, usually with a tricobalt mine or torpedo).
This is made even worse by the endless spamming of system disablers, so you don't have any shields, can't fight back, and can't move. Of course, the webs do this too, and they all spam tractor beams over and over and over, each of them doing titanic damage. Yes, you can counter the disables with engineering team, but they immediately reapply them, and the tractors are so frequent that using polarized hull or what have you is pointless.
It's just not fun to play when an enemy is given so many tools to make it impossible to fight back in any way. It's just frustrating. I don't know why I have to keep telling developers that players don't enjoy being endlessly held and controlled by enemies. Yes, it's expected from time to time, but they've gone way, way overboard here.
Long story short, you're not missing anything if you can't play them. Count your blessings and play some foundry missions. Most of those are better than what the devs are producing anyway.
Once, I was simply called Mojo. Now, I'm forced into a new name, but don't be fooled, I'm the original STO Mojo!