To quote an ancient song of my people, "You take the good, you take the bad, you take them both and there you have..The Facts of LFG"
After a break from the game I've dusted off my shadow tank and dove into HM FPs with my shiney free tionesse gear + some black hole/daily comm stuff I had grinded out earlier and so far the experience has been pretty positive. I've tanked in other games and have always been mindful of mitigating damage so I use all my stuns, defensive cds, debuffs and of course i make sure to keep my poop shield up; so far I haven't had any issues with taking too much damage.
But my one really negative experience was when I guarded a dps at the start of the FP and the healer sent me the most vile of whispers. Accusing me of buying my toon, not knowing my class and various other curse-filled statements. And of course he promptly put me on ignore. He didn't give me a chance to explain that I guard dps in FPs so they can run around wily-nily and shred non elites with little concern for threat. And that the healer should take little to no damage if I am doing my job right. I was shocked, we had a good laugh about it in group chat and a few minutes later another healer filled in. Still, it was bizzarre how mad this bro got.