Hey Toby, welcome to the forum! So pleased you found Huel in Sainsbury’s! As Hunzas has said, it’s a different taste and texture, but nutritionally it’s not so dissimilar. Powder we have more control over the nutritional profile since…well it’s powder, so Powder probably has a ‘better’ nutritional profile, but Ready-to-drink’s nutrition is still really good compared to most other lunch options 
We hear you, and the others who think this. We are working on ways to make Huel easier to trial, however the key point here which I’ve said before is that Huel isn’t the sort of thing you try once and fall in love with the flavour. When you try it once or twice you don’t get the benefits you do of building Huel into your lifestyle. Trying it once or twice you can only judge it on flavour, not nutrition, how it makes you feel, how convenient it becomes in your life and how much money you save compared to lunches out (for example). Taste can easily be changed to your preference (there are tons of tips and tricks here on the forum!).