I loved the first season, the second season was pretty good but the Chloe-arc sucked so I enjoyed it less.
The third and fifth are my favorites. S4 was meh. S6 was meh, I hardly remember S7, S8 had great moments and an interesting arc but after the finale 70% of the fandom wanted Chloe to DIAF so they did something wrong.
And S9 is abysmal.
So.. yeah. If you're gonna rewatch stick to the early seasons.
I won't, they had sweet chemistry in the beginning but the writing just killed them.