What version of Nvidia drivers are you using?
Hmm, that sounds like a more serious issue.
There is a chance eON wrapper needs something that your OS isn't providing
Borderlands 2 is an interesting problem as well.
I haven't tried it in Mint yet, but Torchlight II runs perfectly.
I wonder where you could post this problem? Its not cool because I don't have any issues at all.
Do you have the 32-bit libraries installed as well?