Alex Smith's completion % numbers are misleading, it's easy to have good completion % numbers when 73% of your throws are under 10 yards.
While Smith’s stats above took a major uptick starting in 2011, there were still some red flags. While his 70.2 completion percentage last season was impressive, it also showed his unwillingness to take chances and throw the ball downfield. His average depth of target of only 8 yards was the fourth-lowest of all quarterbacks and only 8.7 percent of Smith’s passes traveled 20+ yards downfield in 2012. Among quarterbacks who started at least half their games, only Christian Ponder had a lower percentage.
He also has awful pocket presence:
Smith also led the NFL in 2011 by taking 44 sacks, and was sacked 24 times in nine starts in 2012 before being replaced by Kaepernick. Smith was sacked on one third of his pressures in 2012, which led the league by a wide margin.
The bottomline is this, Smith doesn't win high scoring games. He relies on the running game and great defense to win games. That is the reality. Reid's quarterbacks average 35.7 attempts per game, Smith's record when he has atleast 35 attempts is 3-13. Just face it, he is a servicable qb that will be starting for us until we find a long term qb solution.