*shrug* Say what you want, the GH franchise used to be a fine vehicle for both killer, twitch arcadey gameplay and killer music that has very little opportunity for exposure nowadays. The whole franchise just took a collective dump as soon as Activision took it over and I'm thrilled that sales are finally starting to show this...lousy song selections in GH 3-5, butt-ugly interfaces, the way the games create "challenge" by simply killing you for a small handful of missed notes, overcrowding the tracks and limiting star power phrases, no thanks. The band specific games aren't a horrible idea, but...sorry, not Aerosmith, not Metallica with the gameplay issues I mentioned before (I feel like I get killed for no reason on the more crowded songs) and sorry, not Van Halen without Michael Anthony in tow and the "modern" vision of the band (and seemingly random support tracks). And Smash Hits is just plain garbage...every song is charted horribly (including the ones in the Harmonix games that were a lot of fun) and the whole thing is simply not fun to play at all.
And Band Hero...no. Horrible idea. In fairness, I feel the same about Beatles Rock Band and Lego Rock Band...both are geared towards casual play and not very exciting overall. The games need more stuff like the recent "Rust in Peace" DLC (which is both challenging and well-charted...oh yeah, and the music from the album itself is definitely a classic).
Granted, there are a fair share of idiots out there that think they can play guitar based on their success with "Through the Fire and Flames" or even "Slow Ride" (lol). But I really think the problem is (or was) more overall quality than over-exposure.