Hey, they aren't the most original band out there, but they are pretty up there. Otherwise I know personally I would slaughter anyone who started a thread like "MIKE IS JESUS OPETH 4 RULZ!~1" (if they were serious) and I think most of the people here would too. There definetely is plenty more out there, but give Opeth some credit.
As for me, yea I found about Opeth around February of...well this year, but I had, over the course of the preceding 3 months, given myself quite the metal background for someone involved for, well, 3 months. I still consider them amazing, though I never feel like listening to them, unless it's a particularly upsetting/winterlike day. Come January I'm willing to bet Still Life will be on 90% of the time...
Recently I think they are the newest "gateway" band. If I were to be selfish I would say "this sucks n00b, I wish they would all leave and leave the underground undergrounded" but this may well be a good thing. Even though it hasn't happened yet and it's not likely to either, maybe eventually we will get some n00bs who don't do what the other guy mentioned, only respect the Britney Spears aspects of Opeth. Like the majority of people here, I completely disregarded progressive music as a whole until I heard them. Funny because I heard the term thrown around a lot, but I never liked it or paid attention until I heard Opeth, and said to myself "this is progressive...." Anyway, yeah I think Opeth is becoming quite the gateway band, and between them and Children of Bodom, and the recent thousands of rap/bm/grindcore/UNORIGINAL bands out there, I fully expect this stuff to eventually be played on the radio, and not even the underground stations or shows. I can see this stuff, eventually going into full rotation. Of course it won't be bands similar to Opeth in complexity, more in the use of blast beats and growls, and not pertaining to Opeth, stunted rhythms and vocals. Won't be much better or worse really, except that when I say my favorite band is Death I likely won't get non-metal people to give me strange looks and whine about how I'm "messed up, retarded, need help, disturbed."