Considering some of the mentions I'll add some more:
Kenneth Branagh as Kurt Wallander.
Woody Harrelson as Marty Hart.
Colin Farrell as Ray Velcoro.
Rachel McAdams as Ani Bezzerides.
W Earl Brown as Teague Dixon.
Michael Harney as Steve Geraci.
Nikolaj Lie Kaas as Carl Morck.
Stellan Skarsgard as John River.
Iain Glen as Jack Taylor.
Gillian Anderson as Stella Gibson.
Richard Harrington as Tom Matthias.
Dominic West as Jimmy McNulty.
Wendell Pierce as Bunk Moreland.
Personally I ppreferred the WW2 over the post-WW2 episodes.
I preferred the latter because the show had a bit of darker edge and the supporting cast was much better. Foyle's son as a character was for instance quite annoying while Foyle's colleagues in the later episodes were all well played.
I've only seen about five episodes, but he's not a bad shout when put into context.