Just saw this again; and yes, Quorra (Olivia Wilde) is gorgeous...especially in those outfits.
Some things that were questionable:
*Flynn (Kevin) and Quorra don't have anything going on for 20 years? (I'm all for May-December romances).
*Since majority of the population in the grid are programs, and there are many who oppose CLU...it comes off as if CLU and Rinzler/Tron are constantly going into battle. 247 or whatever passes for an entire day in the grid.
In the first film, it was a bit obvious that Sark took part occasionally in the games....actually allowing him to overlook other duties, given accordingly by the MCP.
*Sam Flynn doesn't seem to be too surprised of the grid when he goes in. It's like: "This is not happening"...and suddenly he is off to the games, and surviving left and right. (From a writing pov, as well as a dramatic pov...it would have been cool to at least get a 'sense of wonder'...since Sam has only heard of the grid...and is just, at that moment, seeing what his father was working on years ago).
*CLU feeling like the abandoned son, wasn't played much until the end; and I didn't really catch it until my second viewing. Yeah, there was the Frankenstein aspect, but the abandoned sons (Sam and CLU)
could have been a compare/contrast kind of deal.
*What exactly would CLU do in the 'real world'? With the MCP, it was a typical computer who wanted to take over the world....and Tron/Yori/Flynn/Dumont needed to stop it...or him.
What powers would CLU have in the real world?
On the other hand: Other than hotness, how is a computer 'iso' (Quorra) able to live in the real world?
*What happened to Yori?
***
As a writer, I find that too many questions (from readers) means that the story needs work. Granted, a sequel could answer many of those questions...but I personally think it's best to get a strong story done the first time around.
With that said, I still found it enjoyable...