Samurai, unfortunately, is a job where if you aren't stellar relative to the group, you're borderline useless. This is due to it's only contribution being raw damage. A bad Dragoon still offers piercing, Battle Litany and Dragon Sight whereas a bad Samurai offers nothing.

Now with that said, if you're dedicated, you can not only play Samurai, but find groups happily willing to accept you. Just keep in mind, you may struggle depending on what your aspirations. If you only want to get your feet wet and join a more casual static or pug, don't worry too much about meta or what have you. If you eventually aim to get into more mid groups though, it can be difficult squeezing in as you're generally competing with Monk and Ninja—the latter being very popular.