Underrated/underseen Actors?

Oh, my god! Gena Rowlands, definitely. She's a powerhouse, but she never really broke into the mainstream. I mean, I guess The Notebook gave her some much overdue exposure (and even in that lame-ass movie, she's brilliant. So is James Garner...), but even that movie she's only in for a small portion.

I'm actually not even familiar with Pellonpaa's work, so I'll have to take your word for him.

Stacy Keach is another, absolutely. He had a brief burst of leading man roles in the 70's and 80's; but yeah, he pretty much got pegged as a supporting actor after that, it seems like. Too bad, he's got one of the coolest voices on the planet.