AFK Arena is a pure idle game, it has a lot of additional game modes and a selection of seasonal events, but in the end of the game it's an idle game. If you are not into those you will hate this.
With that being said here's pros and cons:
Pros:
Amazing as idle game, it does everything an idle game should do
Very charming artstyle
Your team can grow even if you're very lazy, you won't be top tier, but a guild can help you get some edge that you won't get on your own
Tons of lore and content, animations, cool social media stuff, active community
It becomes very tactical as far as team composition and equipment goes
If you're a casual player who enjoys idle games this is the best game for you, best time waster in the world.
Cons:
If you take the game seriously and are prone to become competitive in games avoid like the plague.
Obscenely pay to win, whales control everything and its no secret the high VIP talk to developers
Yeah, VIP system
AFK Arena Youtubers are often notoriously terrible at the game and a lot of players take bad advice from them
Even if you spend money, there are people spending way more money than you ever could, and playing all day, every day, do not attempt to be a top ranked player or anything silly
Endgame is just a chore with lots of tedious repetition