For his career, Leinart is 10/27 for 399 yards, 2 TDs, and 1 interception on passes thrown 31+ yards in the air. (Data from ESPN.) That's actually pretty good - 103.8 QB rating. However, he is only 2/9 for 40 yards, 0 TDs, 0 interceptions since 2006, so it's been awhile. It will be interesting to see how he performs on the field this season. I am not a believer.
Another way of saying that is that he was 8/18 for 359 yards and 2 TDs on long pass attempts in 12 games started his rookie year, which is even more impressive.
Well, if you want to focus on breaking down his rookie year, you should probably look at the whole picture

asses of up to 30 yards: 206/359 (57.4%), 2188 yards (6.1 ypa), 9 TDs, 11 interceptions, 70.9 QB ratingPasses of 31+ yards: 8/18 (44.4%), 359 yards (19.9 ypa), 2 TDs, 1 interception, 136.1 QB ratingSure, that is a nice performance on those 18 attempts of 31+ yards. But it is a horrid performance on all of his other passes, which collectively represented 95% of his rookie season performance.
But I'm sure people will focus on what he did while coming in late in games, playing with a shoulder injury his sophomore season, or on short notice when Warner decides on game day that his neck hurt and he wouldn't be able to play even though he'd said he was going to all week. That fits their preconceived negativity about Leinart much better. BTW, is there any stat showing how many of those 9 passes since 2006 were hail mary bombs?
Nice shot at Warner.

You are welcome to go through the play by play to count hail marys.