Embiid certainly doesn't SUCK, but I can understand people not being a fan of him 100%. Overrated, maybe. Depends where people are rating him. Best player in the league? I certainly wouldn't say so, but he's inarguably one of the best.
It's a complex issue but one I can relate to a lot as a Rockets fan. Harden was always one of, if not the most hated star player in the league during his peak. It was easy to shit on him and try to take away from what he was doing but I think from an unbiased perspective, you'd have to give him his props for the level he was at.
Of course, he had some of the most tragic playoffs meltdowns in history but he also spearheaded a ton of wins and made some pivotal plays, with the Rockets routinely winning playoff series and reaching the WCF on multiple occasions with a less than stellar, but people tend to overlook that. Hell, the 2018 Rockets were about to eliminate the Warriors dynasty and in all likelihood could have won the Finals, before CP3 got hurt and the team somehow missed 27 consecutive 3-pointers in that 3rd quarter, a handful a which I'm not gonna lie - they got fouled on and nothing was called. But I digress.
The reality of it is, when you have a star player on a massive contract that is extremely ball dominant, you live by the sword and die by the sword. You're gonna have to live with subpar supporting pieces most of the time. Your ability to win is mostly gonna hinge on how one player performs. It's easy to say "they don't have enough help, no one is stepping up" but when you're a player that is a vortex for the ball and you're dominating basically every offensive possession throughout the season, you can't bitch when the people around you aren't prepared to fill the void when you're having problems. It's like, you wanna win your MVP, put up crazy numbers and soak in all the adulation but when the going gets tough, it's still on your shoulders to get the team wins.
Now I personally am not that big on the "ring or bust" mentality and I also think that literally every star player in the NBA gets an undue amount of criticism, but I also think it's fair to have these conversations and for any player to want to claim they're the "best", they're gonna need a ring or two to back that up.