I stopped watching The Rookie after I finished season 3 and just decided to get to it again. From what I remember, the show was pretty serious... Especially in season 1, which was the most realistic and grounded season. Season 2 got a little out there but had more action. And season 3 tried to balance some stuff out. (This was when real-life issues bled in the show more, and they had to do a little social commentary. I honestly thought the show handled the topics well enough.)
I got back to watching The Rookie partly because I just watched the first two episodes of The Rookie: Feds and that was so campy-corny-bad. And what do you know, season 4 and 5 are exactly like The Rookie: Feds. The plotlines are so outlandish! It also started to have a whole lot more romance too, like wtf. It felt like an 80s soap opera. Actually, everything about The Rookie feels 80s, except for season 3, but still. Man, I guess it's still good to watch for some people? If you like crazy and GoT.
Season 1 was an 8 for me. Season 2 and 3 were a 7. The new ones stay at 6. The direction of the show is not consistent at all, plus they have notable cast members leaving every season. The show is probably gonna get worse every new season until it's just so insane, you can't even comprehend it anymore. This is literally just a soap opera for Nathan Fillion fans. Honestly, might have accidentally sold myself on this show.