>>34931460Gen 1 is the single most important and significant gen since it crafted the formula which has helped pokemon stand the test of time. Every other gen merely touched up and glittered the formula, not really adding much of note other than slightly different scenery.
To call it shit is the most underage thing you can do. Overrated? Debatable, since it did the most leg work at crafting Pokemon's identity. Great? Again, debatable since it has aged in some regards. Shit? Unless you're admitting every game in the series is shit, then no.