I started a similar thread on the ProgPower forum. Although my thread was more about "losing interest" than "can't listen to". Regardless, I'll just cut and paste what I wrote there...
Evergrey - I suspect this is about two things. First, their change in direction doesn't appeal to me. Second, when I saw them at Jaxx, they were so drunk, they could barely stand. I lost a bit of respect for them that night.
Symphony X - although I think the new disc is good/very good, I don't like the fact that they're growing heavier with each release. I understand they need to make a living, and that playing Power Metal sells more t-shirts than playing Prog Metal. However, it's just not what I want from them.
Dark Tranquillity - although most everything they do, they put their heart and soul into, they're becoming monotonous.
Soilwork - they continue to grow more and more melodic (e.g. softer). Although there's still moments where you see flashes of their roots, the shift in direction seems like a deliberate ploy to sell more tix/CDs/t-shirts.
Opeth - Deliverance was sub-par, Damnation was disappointing, and Ghost Reveries was flat out awful. While I think it's somewhat likely that Mikael will eventually drift back into a creative head space that appeals to me, Opeth is no longer a blind buy for me.
Kamelot - this is a band that really needs to shake things up. When I heard the new CD for the first time, I could easily predict change before they happened. No longer a blind buy for me.
Zod