The fault lies on both parties in Smith and the coaching.
I do believe Smith needs to be more aggressive at times and deliver on tough riskier throws. It just seems at times he's so worried about making a bad throw and getting an INT he would rather not make the throw at all. So you would like him to exercise caution in situations he needs to when protecting a lead late in the game or deep in your own side of the field but other times you would like him to play more loose. Seems like he's at his best when he's in situations like the second half of the Houston game where he has nothing to lose and can play completely free.
The other and bigger part to me is coaching. 3rd and 10 is not a high percentage conversion and defenses are going to make sure you throw underneath and aren't going to give up a 10+ yard play. Couple that with the lack of a "throw up there and he'll grab it" type of WR it's not totally shocking his best move was to hit Gore and hope for him to break one. Most successful offenses find themselves in 3rd and shorts more often than naught and not 3rd and long.
Basically our offense pounded Gore for 1st and 2nd down for barely gain and than asked the Smiths (Troy also) to come up with a 3rd and long conversion far too often.
With what our current offense should be in the upcoming season we should be much better in that regard since we know have a big bodied guy in Edwards that can go up and grab a ball and I believe we'll get far better use of Davis and Walker than under Raye.