Although I understand not everyone shares the same taste, when people complain of the flavor it has me guessing they aren't really the best cooks to begin with.
Thats a slap in the face for some, but what I mean is some people are great cooks for a certain style of food, or things that are regional to them, anything new turns out bad. To one form or another many of us fall into that, just some far more than others.
Assuming you have a good quality quinoa to begin with (if old it gets an odd flavor like everything else), if you think it tastes bad, try rinsing in a fine sieve first, then cooking in a stock of your liking instead of plain water (your water alone may also be part of the problem)
You may also like it more under or over cooked. But mostly the use of a good stock over plain water should make a world of difference.
Next pair it with something with a little "juice" like bite sized pork cooked in a deep pan with onion, garlic etc. A good amount of olive oil, and kale tossed in at the end. Scrap the bottom of the pot good and add either a little wine at the very end or go a different direction and mix in a bit of sour cream. You'll get a shallow amount of "gravy" to spoon over the quinoa along with the meat.
There are tons of other options to using this stuff, from soups to green salads.
Bottom line if it tastes like grass clippings you are doing something wrong.
And yes it can be eaten stand alone like rice, but it costs more.