My complaint with tanks is largely the same as it is with healers. They all feel very homogenous (similar rotations, mostly identical cooldowns) and recent fight design making them just feel like easy DPS (bosses auto-positioning, infrequent/negligible auto attacks, massive hitboxes). Plus they have so much self sustain that you almost never feel like you could die unless your cotank fails to provoke. I do think tanks need the fewest adjustments of the roles, but this is more a comment on how bad healers are and how dull DPS have become than it is praise for current tank design.