Yes. Even when compared to other vocalists in prog/melodic death metal, guys like Dan Swano, Mikael Akerfeldt, and Mikael Stanne still kick Anders' ass in the vocal department. If you were to compare the clean vocal performances between those four, the only way one could believe that Anders is superior is if that person was entirely tone-deaf.
No. Being worse is not being bad.
Never heard of Swano and Nightingale before, so I randomly found Nightfall Overture (song) and daaaaaamn, pretty fucking good. Is that album worth checking out? Not a fan of that piano, and overall the song is way too progressive for its own good, but chop down 2 minutes from it and it's easily a 9/10. (By the way, arund 4:30 and onwards it sounds like Diablo 2 LOL, same fucking guitar tone and style)
Stanne is fucking shit though, he is the sole reason I am not even trying to listen anything from DT aside from Skydancer - and yes, Anders is terrible on it too, but at least listenable -, because when he does that growly thing I want to shoot my brains out. His cleans are nice though, so it's sad how he wasted his talent. From my perspective, of course, I know many many others have no problem listening to a demon choking on words if the music is good.
By the way, Anders has a much different voice to begin with. Both this Swano guy and Stanne have a very deep, masculine tone. Anders' is much lighter, and that's part of his uniqueness. Sure, being unique means you either fall in love with it at first sight or absolutely detest it. I did the former, as I absolutely like his somewhat chaotic singing style, like the way he sings Borders and Shading and the last chorus of TQP.
Swano makes you one with the music in Nightfall Overture (like a lullaby), while Anders makes songs personal, more relateable for you - talking about the singing, not the lyrics. It's apples and oranges, but Anders does great justice to his own style. You can criticize him in a vacuum, but he managed to dug a hole where he shines bright.
I'm definitely a hypocrite saying this, but it's pretty disheartening to see how most of you treat him. The guy gets no fucking chill; 20+ years in the industry, being the frontman of an iconic metal band, constantly getting shit throughout all of his career, and even when after all of this he writes whiny, self-conscious lyrics he is ridiculed for not being a fucking secure man.