Leinart has had many flashes of brilliance... He had a really shitty time in Arizona, but that team was a wreck.
Sure, they made it to a superbowl with Warner, but that was a hard fought run and they didn't get into the playoffs amazingly that year, they just got through the playoffs against teams they should have gotten beaten by, but Warner pulled it out.
He's a hall of famer after all.
Leinart has the tools, but his mental toughness is where he's questionable... He got the shit kicked out of him because the line in Az was so shitty.
I think the Texans team is better this year than all of those Arizona teams and Leinart will be a lot better than he was there.
Will that equate to continual winning? That's a tough thing to determine, but he will be better than in the past just because of the team.