I’m comparing the game to other strategy games like it, so the 5 stars is relative. There are things I don’t like about it, but comparatively speaking, it’s the best mobile strategy game I’ve ever played. (I’ve spent a lot of time playing Game of War: Fire Age and West Game as well as STFC.)
First, I love Star Trek, so I’m biased right out the gate. Other things I like that separate it from other games: they give enough free peace shields per day if you do all your daily tasks to stay shielded 24/7. There are limits, especially for low level players, on who can attack you. Until you get higher level, only players within 2 levels of you can attack you. You NEVER run out of stuff to do. In fact, the more you play, it can get downright overwhelming how much there is to keep you busy.
That being said, there are downsides. Like other strategy games, it’s impossible to be a top player without spending. There are a lot of f2p players who enjoy the game a lot, and you can do everything, but it just takes A LOT longer. I’m one of those who spends a little, and I’m in the mid-range as far as power. Of course, there are whales who spend thousands who you’ll never be able to compete with. However, my server, and I believe most if not all servers, have player-organized/enforced Rules of Engagement that limit bullying and sheer domination by p2p players.