I'd call that an oversimplification
Seems like they made more of an attempt to actually sound like AIC, at least on some of the cuts. It certainly doesn't remind me of PJ all that much. Definitely not as *good* as AIC but again, I feel like it'd appeal to most fans. Oh well. Maybe you'd prefer the Truly album? At least try the opening cut- probably the best one and includes some killer riffage.
Don't think I ever heard Green River but have sampled tracks by the other 2 (may have heard the full TotD album at work many years ago- not sure) and yeah, they're nothing special. I do think the Mad Season is significantly better but like I said, I certainly wouldn't call it top tier grunge. And yeah, the cover art seems better suited for a patch or bumper sticker.