Vince made big strides last year, the Titans are one of the few teams who has shown a willingness to take a project QB like McNair or Young and develop them over a period of time. The only reason VY played so early on in his career is that Collins was awful the first year he came in, and the fans clamored for a change. His rookie year he got by on his playmaking skills and a lot of luck and parlayed that into an 8-2 record.
From there you really can't just hand the reins back to a guy who went 0-6, so he kept playing even though he wasn't really ready and teams were able to expose his flaws. Sitting again the year after really helped him get his head right and restore his confidence.
When he got the ball this year he was ready- I watched every Titans game this year and he's twice the QB he was 2 years before, but people already formulated opinions on him. I can see why most opinions didn't change since his stats weren't exactly gaudy (maybe because we had a 2,000 yard rusher!) and he already pulled that routine during his rookie year but if you watched, he was much better. I'll say it now that with Britt, Cook, Gage and CJ out of the backfield we'll have one of the top 5 offenses in the NFL next year. We'll probably still be in the 10-15 range yardage wise because we're a running team first but the Titans WILL be able to throw the ball.
Not to mention that VY has the 6th best winning % among starting NFL QBs in the league.