Ofc we dont know exactly how he is to play yet but I cant imagine him being bad with the sheer amount of options he brings.
%HP damage, zone control+wave clear, long range execute, aoe shielding, aoe speed boost in a pretty big area, mana sustain (not sure how relevant that is), several options of cc depending on situation and a potentially huge crowd control ultimate that absolutely screws a ton of champions.
Obviously it comes down to how the champion is tuned but once players get good with him and pros have some time on him I cant imagine him being bad. Worst case scenario he ends up being a “pro only” champion like aphelios. Huge skill ceiling but when used by pros becomes so stupid he has to be nerfed into oblivion
You seem to confused difficult with versatile. If your champion is difficult for the sake of being difficult yeah but if your kit is difficult because it has almost infinite options you end up with a champion like aphelios. He just does so much stuff in the hands of a good player it doesnt matter that he is ridiculously complex because he has a tool for literally every possible scenario