I'm currently driving a 2012 Altima rental. It has the 2.x with the CVT. I like it. In fact, I like it a whole bunch more than the modern 6 speed auto's that upshift into an unusable gear right away, only to downshift 3 cogs after rounding the corner.
The CVT is a seamless and smooth way to achieve excellent response, good power and good MPG's.
In fact, Nissan has increased the gear ratio capability of some of the CVT's for 2013. That's good, as the Altima turns 2100 at highway speeds and probably could turn a bit less.
Also, they have a very positive reliability record. The Altima I'm currently renting has nearly 50K on the clock and still drives perfectly.