I personally like his Dragon pet effect, though the way it's currently implemented adds to the overall clunkiness of his ult (it kills his ghost, for example). I think the main complaints surrounding Mordekaiser are a) that he got pulled out of the solo lanes and got pushed into duo bot lane with a set of changes that still feels very artificial (his W passive especially is neither thematic nor as appreciable as it should be, imo), and b) that, in a similar vein, his core build is now a weird mix of AD, health and
, with the resulting lack of AP making his ultimate feel even weaker than it felt before.
While I think the Morde rework was a lot more successful than I thought it would be, my main issue with it is that it didn't really address many of the issues that were holding him down before, and added a few more problems on top. Morde suffered, and still suffers now, from an E that's lacking in real counterplay and a power budget that's heavily skewed by his ultimate, and for the wrong reasons imo: the most iconic part of it is the ability to enslave a fallen enemy, but a lot of its power is placed onto its point-and-click nuke/heal with a weak overall DoT, and even the ghost can end up feeling fairly crappy when it's an AP or tanky champion, with Morde instead just gaining bonus stats. By all rights, the ghost should gain a portion of its own bonus health and AP as bonus damage to replace the current AD bonus, and the active should either deal no damage at all or be used only to raise already fallen enemies, which would allow his basic abilities to be a lot better. As a slow, tanky DPS champion with no CC, Morde is the perfect Juggernaut, and so an ideal candidate for an update, but the changes he received made him even more binary than before, made his already weak health cost/sustain paradigm even less meaningful and completely changed Morde's gameplay in ways that weren't really necessary, while ignoring a lot of the issues that held him back. It's impressive that he became a legitimately strong bot lane carry, but in doing so his update alienated his fans and frustrated just as many people who've had to deal with him post-update.