Some things are fun in the game. I love getting L-Ms that i need and opening boxes, although that can be disappointing. I love portals and new items. I like well-rounded mechs and experimenting with builds and the community.
I dislike raid and titans, and luck in the arena. I dislike the incessant grinding needed to level up a mythical item just a few tiers. I dislike how long it takes to get up just a few stars, just to get knocked back down the next day.
Its really just hard to say the game is fun or not fun as a whole. Some things yes, some no.