Although I haven't played the last couple releases, the Hitman series always has solid voice acting with the core cast.
Atlus has been on a tear in recent years, and it's pretty much expected that anything released after Digital Devil Saga has astounding voice work.
Liam O'Brien, who still does voice acting started doing voice directing a while back, and every game he's been in charge of that I've played has been top-notch.
As Kaio said the average has risen dramatically as of late. Laura Bailey and Troy Baker are in pretty much everything (and it's kind of for good reason). The only thing I'm not particularly fond of is celebrity voice work, it very rarely works for the better, and even when it's awesome (Oblivion, and Patrick Stewart) it eats through so much of the budget that you have to reuse actors for everything.
Still waiting on my big break