Wether it is meaningful or not is quite subjective. In previous expansions a tank who put out an excellent performance made a more noticable impact on the overall clear time as the difference between high and middling performance was much larger. Now when i strive for that higher performance I do not find it as impactful, tank players can die and still get above average total damage, and the overall clear time in much more heavily weighted on dps and healer performance. As ive said before Im playing primarily off tank this tier and outside of the raiden add in e5s (which can be dealt with by dps or the mt with enough coordination) i feel basically vestigial until the latter half of shiva and even then im more often than not just popping mitigation to make autos hit for less. For me the satisfaction is two fold, the gameplay and the final number, right now both are lacking, I only find gnb fun gameplay wise but most of the time im just playing like a dps, and numbers wise you dont feel like the threat you used to.