This game is solid. I'm currently in Chapter 6. My expectations and preferences are definitely different from the RPGFan reviewer's, because I love it so far.
Rain Slick 3's an extremely streamlined RPG with HP and MP management only taking place in battle and the class system in place leveling everything simultaneously. Equipment is kinda bare-bones, but the class system allows for great team customization while still making characters feel distinct (each character has a base class and two secondary class slots, selectable from around a dozen). Combat is turn-based, with speed represented by a meter with moving character icons. Looks like a SNES game, but has too many modern ideas to be from the 90s.
But most of all, Rain-Slick 3 is hysterical. The dialog's extremely entertaining, and is absolutely consistent with the Penny Arcade comic strip and the first two Rain-Slick games. The plot is similar to the first two (oddly arbitrary tasks mixed in with RPG conventions and Cthulhu-esque lore), but it plays like Final Fantasy V mixed with Grandia II. Plus it costs only five bucks (US$), and if you pick it up on Steam this week you get the other two Zeboyd RPGs for free. That's a pretty good deal.