are beautiful board games with simple rules but with broad strategic possibilities.
You will enjoy go-moku and renju especially with good opponent. It is not enough to play by intuition and wait for an opponent mistake. If you want to win you have to find an ideal strategy. You can be sorry for every weak move.
In this way go-moku and renju are not any worse than much more famous games such as chess or GO. If you want to be ranked among the best players you have to play a lot and you also have to study.