Why so? The Olympic Games is the main event for professional track and field athletes, for instance, and if you're interested in professional sports - or any sports of absolutely leading edge competition, even when semi-amateur - then Olympics is the big event.
Oh many reasons. It is the most colossal waste of money. It is a horrible IP abuser. Almost everything surrounding it is massively corrupt. Some sports don't deserve to be in because they are not about (or less about) individual athletic performance.
Even if you like the competition those seem like strong reasons not to watch.
I personally think that if you are going to allow finely engineered shoes, poles, javelins, boats, balls, bicycles, then you should allow finely engineered bodies.
So then there is absolutely no point in watching. Well, not until they start the doping league. (Should we debate whether the current one is?)