He's a great voice actor and I can't imagine Raiden without him, I don't understand the intense hatred some fans have for the character, he gets annoying at times but nothing that ruined the experience for me. Not to mention this is set between 2 and 4, so it would be weird to not have him doing it, I could understand if it was set years later or something.
I keep forgetting about this game and it seems odd that we haven't heard anything about it in ages. I hope they're not having trouble, because while I'm not as excited due to Kojima not being the main guy behind it, it's a Metal Gear game and I will get it straight away.
I'm expecting this game to be delayed until 2013 if nothing comes up at E3 this year.