It’s clear from my own experimentation and interaction with the community that we’re all different – not only in terms of our nutritional needs, but most especially in terms of taste. Some of us will be fine with something that others find completely revolting. As always, my suggestion will be more experimentation to find the right balance of ingredients and an overall approach that works best for you.
As for what you’re doing now: First off, make sure you’re drinking it cold. If you’re even close to the borderline of not liking the stuff, drinking it warm will be even more of a put-off. Always combine it the night before and fully refrigerate.
If you’re not a fan of consuming something that’s even a little bit uneven, definitely use a blender. Better still, throw in some ice cubes to make a blend that is both smooth and icy cold.
Clearly some of our taste preference and perceptions of palatability are psychological. I have a theory that the folks who have the biggest problem with DIY soylent tend to be the ones who are thinking of it in terms of “drinking” it straight down the hatch as opposed to “eating food.” I’ve noticed that I actually “chew” mine a bit before swallowing, which is perhaps why I prefer some unevenness and don’t typically use a blender (whereas my wife insists upon it).