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Pros
Pro Interesting stories
Main plot at first was very boring and repetitive, at least for me. I found the alternative plot much more interesting tho repetitive too. However! However... After getting to chapter 5 you're gonna love it. Absolutely brilliant. And oh, there are tons of missions that tell you something about the world be it main plot or event quests it all happens on The Continent of Babel. So be prepared, Alchemists!
Pro Collabs
Are you a fan of anime? Here you'll surely find something that suits your needs. From Fate, through Attack on Titan up to 7 Deadly Sins this game has it all. It's always cool to watch your favorite character kick some butts on the battlefield.
Pro Possibilities
Combos you can pull off using buffs, debuffs, attacks, synergies and other things is just out of this world. Making an enemy skip most of their turns or hitting them like a truck with a set up attack feels much more rewarding than in different hero collectors/grid based RPGs. The trailer did not lie - possibilities are limitless.
Pro Amazing immersion
Characters have many different voice lines depending on actions like mocking an enemy upon evading or thanking for buffs received. Each character has it's own personality and most of them have some background story missions that unlock some powerful buffs upon completion.
Cons
Con Time consuming
You need to have a lot of time to spend if wanna play this game.
Con Poor banners and pull rates
Banners got pretty expensive these days so that one has to know who he wants to go for. Otherwise he may just end up spending a lot of Gems/$ and not getting a thing out of it.
Con Weird Content Planning
Oftentimes after getting to a certain level one would call mid/end game the content this game is getting is kind of weirdly planned... There are weeks when nothing is happening and there's nothing else to do except your dailies but sometimes there are weeks when there is so many events you don't even know where to start. It's very overwhelming. Of course there are normal weeks as well but just don't say you weren't warned about that flood of Events!
Con Somewhat slow progression
Unless you are lucky or dedicated you will struggle leveling your heroes up. Pick a bunch of them instead of going after all the shiny boys and girls you have pulled in the last 20 summons. There'll be time for that too.