I think you are 100% correct. It was a blown opportunity. With Everton's injuries we were in a position to actually take all three points. This is what made starting Ameobi and Duff so infuriating.
However, once we were down to 10 men, a draw was a pretty good result for us. We thoroughly deserved that point. Bassong, Enrique, Colo, Taylor all played well and that is something to feel good about.