If it's a good film I'm not worried. Besides who else are they going to use as the first villain but Darkseid? Starro? Amazo? Darkseid is the best choice they got.
Though it makes me wonder who they might use for a follow up. Maybe the White Martian Hyperclan from Grant Morrison's run? Or the OMAC Project, with Maxwell Lord as a villain? Or the parallel Earth where the Justice League are the bad guys? There are some ideas but I think starting off with Darkseid is still the best thing to do. I just hope they do a better job than Geoff Johns did recently in the first Justice League arc for the New 52.