Yeah that’s part of the problem with these companies and I’d imagine it’s a big way they make their money. People buy the giant bulk bags, don’t like it or get tired of it, and throw the rest away and the company already made its money off you.
An exception to this though is Soylent. They have a lot of single serve, pre mixed drinks that you can go pick up and try at a lot of grocery stores if you want to try before buying in bulk. It’s how I got into it in college. Tried one with a low entry price, thought it was ok enough for what I was looking for (convenience, nutrition, shelf stable), bought more.
The best flavor of Soylent is their coffee+mocha flavor imo (although it can be harder to find in stores). But all of the coffee was upsetting my stomach after a while and I couldn’t use it as a dinner replacement because of the caffeine so I stopped drinking it. If they made a decaffeinated version of that flavor I’d probably still be drinking it tbh lol.
Like most meal replacement drinks, the other flavors are tolerable, but nothing I’d say that I overly enjoyed drinking.