Well, if you don't enjoy watching Sentai that often, then there's nothing wrong with it. But, if you want to really enjoy some of the good sentais that are building up the purposes of the team's importance, then I would recommend that you watch the following:
-Mirai Sentai Timeranger
-Mahou Sentai Magiranger
-Juuken Sentai Gekiranger
-Gosei Sentai Dairanger
-Seijuu Sentai Gingaman
-Kyuukyuu Sentai GoGo-V
-Samurai Sentai Shinkenger
-Choujuu Sentai Liveman
-Denji Sentai Megaranger