A lot of the negative reviews are people who think you have to pay to be any good, cards are too overpowered, or por matchmaking. They are all wrong (with an exception, the Royale giant is OP). This game is actually a strategy game. You have to place your card at the right time and in the right location. It takes a lot of practice and patience but eventually you find multiple decks that you work well with. Its always changing due to higher arenas and new cards. So if you do really well with a certain deck in arena 4, chances are that deck is not going to work anymore in arena 8. So constantly you have to be experimenting with new cards and combos.
Practice new decks with your friends and in the training camp. The better you get, the more difficult the AI becomes (even though he never plays how a normal person would).
If you find yourself losing a lot, look up good deck strategies on YOUTUBE in correlation to the arena you are in ( or just take a break after 4-5 consecutive losses)
Its not an easy game. But new people join everyday and it is pretty fair and balanced. Just learn to strategize and you will begin to win a lot.
Thegovenator about Clash Royale, v1.8.1