Pros:
Interesting if you like the anime.
Good if you want to learn the game.
It's "free".
Better play it with friends.
Cool animations, sounds, music, effects, etc.

Cons:
Cards are ridiculous overpowered for these quick match rules.
The rules are different from the classic game.
Way too repetitive once you pass gold rank.
Some cards can be accessed only if you pay.
Some of cards are totally unobtainable.

About 80% of the time it does not feels like playing an strategy game, it does not makes you think or analyze the match like if your life was pending from it, cards are ridiculous overpowered that either you win or lose like on the first turn, that makes this game boring, not fun and uninteresting, HAVING MILLIONS OF PLAYERS WITH THOUSANDS OF CARDS, AND YET THEY ALL PLAY WITH THE SAME DECKS! Where is the creativity?... Where is the strategy?... Where is the fun?...

Rock, paper, scissors has more strategy than this broken game.

Update: Pokemon Showdown has more strategy than this.

Pros: Interesting if you like the anime. Good if you want to learn the game. It's "free". Better play it with friends. Cool animations, sounds, music, effects, etc. Cons: Cards are ridiculous overpowered for these quick match rules. The rules are different from the classic game. Way too repetitive once you pass gold rank. Some cards can be accessed only if you pay. Some of cards are totally unobtainable. About 80% of the time it does not feels like playing an strategy game, it does not makes you think or analyze the match like if your life was pending from it, cards are ridiculous overpowered that either you win or lose like on the first turn, that makes this game boring, not fun and uninteresting, HAVING MILLIONS OF PLAYERS WITH THOUSANDS OF CARDS, AND YET THEY ALL PLAY WITH THE SAME DECKS! Where is the creativity?... Where is the strategy?... Where is the fun?... Rock, paper, scissors has more strategy than this broken game. Update: Pokemon Showdown has more strategy than this.