You have to go into Siren with the right set of expectations, and what those are is perhaps surprising, but it's a crazy kind of fun, even if it's probably too unstable to last.
For the People is a curious Shondaland entry, and curious Shondaland entries don't generally fare well. There is something of a return to the early days of Grey's here though, but those days may be too far gone. Plus, it's largely laughable.
When it comes to the merging worlds of "popcorn film" and "comic book action" you have to be forgiving when the plot starts clawing its way out...
Dark is the surprise bit of brilliance that hopefully has people looking at streaming originals in a whole new way. Easily one of the best shows available right now, as long as the genre doesn't take it out of the running.