BR - Having a solid goalkeeper is absolutely essential for sustaining a healthy title bid. You could have an excellent squad with a sturdy defense, a creative midfield, and clinical forwards and still not win trophies if you have a poor goalkeeper.
We've seen it a number of times, with Arsenal being a perfect example. The Gunners had a fine squad at their disposal in the past few seasons, but Manuel Almunia, their No. 1, let them down with his inability to hold the ball and his schoolboy errors.