Portal 2, Half Life 2 (and its episodes) Uncharted 2, Mass Effect and Metal Gear Solid 2, 3 and 4 all have pretty damn good voice acting.
Dragon age: Origins, Awakenings and DAII had pretty good voice acting for your companions, but bit-characters had awful voice acting and the main character for DAII had a very boring and bland voice.
The absolute worst voice acting I have ever experienced was in "Siren" for the PS2. For some daft, daft, DAFT reason, the english voice actors were all cockney brits (despite the game starring americans and japanese folks) who had all the enthusiasm of a bored person reading a particularly boring recipe from a cook-book.
Dragon age: Origins, Awakenings and DAII had pretty good voice acting for your companions, but bit-characters had awful voice acting and the main character for DAII had a very boring and bland voice.
The absolute worst voice acting I have ever experienced was in "Siren" for the PS2. For some daft, daft, DAFT reason, the english voice actors were all cockney brits (despite the game starring americans and japanese folks) who had all the enthusiasm of a bored person reading a particularly boring recipe from a cook-book.