Karaite Judaism, in my opinion, completely misses the point.
One of my greatest joys in life is honoring Shabbos. Karaites insist that their "letter of the law" mentality is correct, and reject the Oral Traditions. Thus, they enjoy Shabbos in the dark, both spiritually and physically (yes, they sit in the dark).
To this point, Orthodox Judaism does not just rely on Tanakh, but also on the Oral Tradition. Orthodox Jews do not kindle a flame, which is the source of turning lights on and off (thus would be completing a circuit).
When the Torah was given to Moshe from G-d, an Oral Tradition was also given. It is impossible to truly understand Torah without both sides.