That's too bad that it didn't work out for you. Plugging is not the best ROA for everyone but most people get much better results when dosed rectally. I personally experience extremely rapid onset and the intensity/analgesia is significantly higher than oral dosing.
I bother because:
1) instant onset
2) longer duration
3) more pain killing action / analgesia
4) less side effects
5) better overall experience
However, some people get better effects from oral dosing, everyone's body is different, and the science backing up the rectal ROA is variable, including the rectal BA which goes from about 30% (so around the same of oral) up to like 70%, in which case obviously if you fall into this category, the rectal ROA is a very viable and good option.