My overall rating of Night Agent is a 6.5 rounded up to a 7, because I really did like the first season.
Basic premise, an unlucky government employee is given a 2nd chance with a secret organization that is supposed to keep him out of trouble, but... Surprise! He gets wrapped up into a complex international conspiracy with surprisingly ambitious aims.
I think the reason the first season was so much fun was the borderline preposterous story that somehow maintains a thread of believability throughout. Really, though, it's probably the characters that do most the heavy lifting - Night Agent is one of those rare shows that develops every major character, including the bad guys. So when bullets fly and people go down, the viewer feels the consequences, even if the good guys win.
First season did a good job of all of this stuff, so I was looking forward to season 2. While season 2 isn't a complete train wreck, it is worse than the 1st season in all important ways. It's probably ok the story is less ambitious and more personal, but! Season 2 is painfully slow to get going with little meaningful introduction, And! The characters for the first 4 episodes are way less developed and interesting than season one. That is unfortunate - many of the bad characters in season one had unique personalities, and made for quirky scenes. The characters in season 2 are simply not as entertaining to follow, and this is nothing personal regarding character and casting - I'm really blaming the writers and dialog that is serviceable at best.
I don't know, but I'd guess season 2 is just a rushed product compared to season 1, and maybe the budget got slashed. There does seem to be less action scenes and special effects. The further season 2 goes, the better it gets, but it really never reaches the level of the first season, that was only good in the first place.
I gather a third season is being made - I'd hope the writing is more considered, and the characters get back to being more entertaining. Probably could use a boost in budget with more action scenes too.