Sonic P-06 is at least decent for most people around. In fact this is the only way people should experience it (unless they really, really want to have the "authentic" feeling but I don't really think this would be worth it).
No, on the other hand I wouldn't use that game to claim that the original was good, it's like saying Simon's Quest is the best NES Castlevania just because there's a patch fixing the game's flaws.
I would say at least 3 really bad games (Boom included even if it's not canonical I'll still add to the series) and Lost World + Forces while not being good are nowhere near as tedious as Shadow nor 2006, just extremely bland games that tried to be too safe (and the opposite of the spectrum of those two).
As said above it'd be like taking Mario is Missing (yes, even if it's not developed by Nintendo EAD), Bomberman Act:Zero and even Metroid Other M then claim all of these franchises aren't good and anybody actually claiming they are would just be doing "revisionist mental gymnastic" which is a bit too easy to deflect any counterargument...