Snyder is like the film version of pre-made pancake batter. His works contain no deeper meaning or other hard to reproduce aspects like good characterisation or dialogue. While most artists are hard to rip-off convincingly, anyone could make a Snyder-type script. Make sure there's violence, "I'm 14 and this is deep" dialogue, weird fascistic posturing, boobs. Slap on "realistic" CGI and a desaturation filter. Congratulations, you have made a Snyder movie.
I genuinely think that's why he's pushed so hard. Besides the cost of CGI, having such an empty style means you could reproduce it any time with little effort.
Other artists I can think of that fit this description are Tim Burton and Steven Moffat. I know they've made great art before but recently it's just been misses.