I thought it was alright. I'm glad they opened with a walker in the first sequence, I was wondering if this series would be a long drawn out affair of sub plot and story/world building prior to seeing anything so far as the plague beginning, but they didn't disappoint in this regard.
One scene I really liked was one the school buses were pulling away, and that "I told you so" look the kid flashed his teacher, and her reaction.
Considering the WD is the largest show in TV in terms of $ and ratings, I think it's nearly impossible for off shoot series like this to fail, and if nothing else, will give fans something to watch in the off season of the main show if they stagger it a little more next year.
I'm looking forward to seeing how they frame a city the size of LA coming apart.