I THINK the taste issues most people are experiencing is from only using components without added flavours and thus getting the unfiltered side tastes of everything - olive oil, whatever tablets they may be crushing up, salt, caffeine (bitter), etc.
This can be solved with a minimal amount of added flavouring, something as simple as cocoa might already do. Personally, I just use a flavoured whey concentrate, and it’s fine.
The other way to keep in mind is that the flavour experience might just be an issue of adaption. In the beginning I didn’t like the taste of my Soylent, even with flavoured whey and with peanut oil instead of olive oil.
After 2-3 days though I found that I had just “adapted” - I started liking the taste. I assume that was my brain noticing how much better I feel with this badtasting substance - “if it is that good, let’s make him think it tastes good so he eats more of it!”.