I do not hate the genre called "sprite movies", as one can always find good things in the most unlikely places.
What I hate are animations that show NO ingenuity, plot, cohesion, talent, taste, and/or quality of any kind, whether it be sprite animation, fbf, tween, claymation, cut-out, or any other form of animation out there.
People hate sprite movies because it's an easy target, simple as that.
However, trying to vindicate your sprite animations by saying, "it's hard work! I spent HOURS on Google, gimme a break!!" is truly pathetic. Lots of things take hard work in life, but it doesn't neccesarily mean it's for the greater good.
I have tried the sprite animation method, but instead of using game sprites, I had cut out pieces of construction paper, positioned them on a scanner, and made jpegs. It was used for 5 seconds of animation, and its primary purpose was to teach my brother how to motion tween. It took less than 2 hours to make. Quite simple compared to fbf, very simple compared to quality claymation, etc.
Essentially, it doesn't matter what animation style you have, or what method you use, hard work is only part of the equation when aiming for a good animation.