Well I said "in some context or another." We all know what Simmons' flaws are. He's still an all-star despite them. He's improved in many areas and has not in others. He's not a performing at superstar level night-in-night-out (and I see you aren't defending Joel!)
I think Harris was expected to be better too. He's been fine, and I don't measure him by his salary, but he has not consistently been able to offer the scoring (let alone the shooting or ball-handling) the Sixers need (and obviously Richardson hasn't either).
I also wouldn't include the youngsters or bench players as being "of note." Korkmaz is a pleasant surprise, Milton still hasn't been doing it long. They and Thybulle are all still major questions marks come playoff rotation. If Milton and Korkmaz could answer the bell that would be huge but I think it's more likely they're exposed (if they even get the minutes).
Anyway, I just wouldn't single out Horford!