Brian Austin Green
Cheap-looking animation, sub-par voice acting, endlessly cornball dialogue, and an overall air of cheapness pervades all of the season one episodes. Oh sure you'll get a nice dosage of super-villainy and frequent guest spots by Marvelous folks like Silver Surfer and Sub-Mariner ... but you'll have to suffer through some pretty rank cartoon fodder to find 'em. Yes, these things were made for kids, I know, but kids are smarter than this.
To say that the second season is a vast improvement would be a Fantastic understatement. The animation style is more fluid and pleasurable to the eye; the "camera" actually moves around instead of staring drably at the action onscreen; and there's just a bit more "edge" to the second season. It's not exactly more violent or adult; it's just not so cuddly, fuzzy, and kiddified.
(Somewhat annoyingly, season 2 begins with the last episode of Disc 2: "And a Blind Man Shall Lead Them" (featuring an appearance from Daredevil!) Frankly I'd start right there. If you find yourself not digging the S2 episodes, then you should never bother with S1. Trust me on this.)