I watched season 1 and 2 in 2014. Somehow I missed to write a review here. But this gave me also the opportunity to re-watch the show.
'Cleaners' has a fast, humorous, sometimes brutal style, you can even say it is a parody of ultra-cool modern pulp fiction. Dialogs are short, cliché-loaded on purpose, fighting scenes often over-the-top. The show plays with a number of genres, characters and plots, exploits them to a point, but also let them be where they belong, maybe even to honor them. There are a lot of moments where one can recognize some of the ancestors the show 'cites'. I think the movie 'Face Off' is one of them.
If one cannot stand the cut and some scene change, that's understandable. Some people may find that annoying. I liked it, as it is a big difference to so many other shows.
The show is remarkable reckless to its own story-line, but also very kind to its characters. Everyone, even the most notorious killer, gets a positive or sympathetic side.
I found the balance between dark comedy and thriller just right, at least in the first season. The second season is a bit slower, a bit less funny, and a bit too serious sometimes, but has at least 12 episodes instead of 6. The episode length is always about 22 minutes including credits at ~24fps.
Of course there are some mistakes here and there where you have to raise your 'suspension of disbelief', like in so many other crime shows. That is not an extra minus for a show like this.
About the acting, most entertaining for me was Gina Gershon as 'Mother', Clifton Collins as her 'Samurai' Julian is like a character from Kill Bill, and Emily Osment makes a great Harley Quinn-like companion to a bit colorless Emmanuele Chriqui. Her Veronica (or simply 'V') is the only one that didn't quite convince me, she sometimes looks insecure, what she should currently express, or what her role is in this mess.
But 'Cleaners' is overall very entertaining and funny, so I have to give 7 stars.