Overated/underated anime's

Generally any anime that deservedly or for some other ungodly reason strays far past ~52 episodes (at the ass end of the 26-52 episode sweet spot) is at least a little overrated. Dragonball and it's ilk are in this camp, along with Naruto (which coincidentally has the best episodes up to episode 50), Inuyasha and plenty of others. Any anime that has to resort to more than the rare filler (due to being based on manga source material) is largely overrated.

I've noticed many anime that are overrated tend to fall into the Shonen category, as more adult anime tend to be at least a little original or unique in presentation and in plot.

Along the lines of underrated anime two stand out for me: Outlaw Star and Gundam 0083. Outlaw Star is a very good Shonen anime, which while not incredibly original, has very strong plot and great action. Gundam 0083 on the other hand is a complex and mature side story to the ever popular Universal Century Gundam story line. It has the atmosphere similar to that of Top Gun, but does it differently, handling the plot in the typical Gundam Style. I highly recommend any anime fan to check 0083 out just to see the awesome mecha designs.

Jam it back in, in the dark.