My first time through this on bass, I was a little frustrated with it. The song is long, yes, and that leads to a VERY long break (185 measures, I believe) in the middle, which is once again a thing that people could really dislike and I'd understand it.
Thing is, the rest of the song - the remaining 11 minutes - are all actually really good. For the first third of its length, the bass more or less keeps up with the guitar aside from the solos, which is pretty awesome with a few added flourishes here and there.
The middle segment is empty, which I personally enjoyed because I don't mind waiting a few minutes if the rest of the song is good, so we'll move onto the final third of the song.
Once again the bass keeps up with guitar, but when the guitar gets a little on the bland and repetitive side, the bass picks up the slack and is all over the board with some pretty awesome riffs while still being the backbone of the song.
Yeah, the Bass has a big gap in the middle and it's not as fun as Guitar/Drums, but compared to the rest of the library, it's still a solid 5-star effort, definitely worth playing.
5/5 - Aside from the break it's amazing.