One of the problems with a "opera" is that the lyrics need to convey the plot and tend to get in the way of the song. This happens in Tommy and is one of the reasons I don't pull it out too often. Quadrophenia works much better as an album IMO. Maybe the "plot" (of Quadrophenia) is a lot looser as a result. On the other hand I prefer the movie version of Quad over Tommy also.