Good game, not definitively three houses but a very enjoyable game. Easy to get new characters, way too easy actually and you end up not developing all enough. Guess you need to just stick to your 8 to 12 favourites and develop them. Easy to change class after you are able to buy seals on the shop, you won't win many on battles. Quite a long game if you do all prelogs and a few skirmishes.
If you like fire emblem, thus will be up your alley. Highly recommended.