I knew the Vergil plot twist was coming at the end, but the way they did it was pretty lame I thought. They didn't really plant many (if any) seeds for that twist at all, so when he actually did that heel turn it felt pretty out of nowhere and basically amounted to Vergil going "I'm evil too Dante, didnt you know!?"
--EDIT (because I wanted to add something in) --
So the sales figures for DmC's first week in the UK are out. DmC took the #1 spot in the UK charts (which isn't a huge surprise as it was the only release in the UK last week). However, it apparently only sold a little over a third 1/3rd of what DMC4 sold (DMC4 was released first week of February 08). UK/Europe's obviously a weaker market than the US, but something similar might happen if we find out the North American sales.
So if you liked the game - hooray, you're #1 over in the UK! If you arent happy with the game (for whatever reasons), well, there's a reason to be happy too.