It's funny how soo many people think that Opeth's music is very complex, technical and yada, yada, yada...when Mikael (he writes everything) doesn't even have one single lesson in guitar to lay back on.
Lets face it, the music he writes is pretty simple (I'm not saying that it's easy to write that kind of riffs and I'm not saying I don't adore Opeth) it's just the way the riffs is written. There isn't many hard passages and such in the music even tough the solos is pretty impressive.
The strength in Opeth's music is much more important than technical shit. It's the endless variation, the epic songs, Mikaels exeptional feel for rhythm and harmonies and the big passion that you feel within form the music. It's the emotion that they deliver in their songs and their interesting mix between accoustic and electric guitar.
In a disscution he even said that Linkin Park's guitarist probably is better than him.
I wrote this because I tried to explain that a bands most stunning and interesting strength's don't depend on the technical level (I obviosly is against Yngwie and sucht artist's). For me, it's more their way to use music as an instrument and to deliver different feelings to the listner.
But this is my opinion, but you are free to disscus it...