Drummers should play for the song, and the song and the band will determine just how complex that drumming can be. Let's look at two very different bands - say, the Donnas (straight-ahead girl punk-pop) and Tool (polyrhythmic art-metal).
Donnas:
http://www.youtube.com/watch?v=nCvRT2sy5FE
Tool:
http://www.youtube.com/watch?v=Lm38Ojh61lY
If you took Danny Carey and plopped him into the Donnas and told him to play as if he were in Tool, the result would be overplaying. By the same token, if you took Torry from the Donnas and asked her to play with that same style along to the Tool song in the video, that would likely be "underplaying".
In each case you could argue that the drumming is appropriate for the song - no more or less complex than it should be. It's when a drummer tries to introduce concepts that do not serve the song (or the performance) that it becomes overdrumming.
currently, One World- The police is playing in my computer -- Is Stewart Copeland overdrumming??? I do enjoy the song though.
what if this song were originally recorded with just time keeping and if some unknown cover band does the way Copeland did in that song??
By that definition, no, I don't see Moonie's playing as "overdrumming". He had to keep up with the windmilling power chords of arguably the loudest guitar player of the time, and easily one of the best bass players ever, as well as a very charismatic frontman. While to listen to some of the Who's songs it sounds like chaos (especially live), you have to understand that Moonie wasn't approaching the instrument in its normal role - and because
nobody in the band was, it worked. Proof of the pudding is to look at the drummers since Moonie passed on. No offense to Kenney, Simon, or Zak, but the difference is that the band became safer, tamer, controlled, and predictable.