Many many things are tasty when shoved in a blender for a meal. Berries, dairy, fruit, veg, whatever. It’s hard to get wrong.
However….. There is a big elephant in the room with things like a Nutribullet. Liquidising food makes it far more easily digestable, spikes insulin more, negates a lot of the point of fibre in fruit and veg because it blitzes it, and fills one up for a shorter time. It actually allows for far more food (and hence of course more vitamins, nutrients, etc) to be packed in more easily – ever looked at what’s crammed into an innocent smoothie bottle then also glanced at the sugar content.
So it depends why it’s wanted. If it’s to cram more fruit and veg in then it’s very effective. If it’s to provide “healthy” meals, then actually just eating the stuff unblended is a better idea.
I use a blender to have two extra meals a day, but that’s because having liquid food allows me to eat more more easily. I’m 94kg and I used a blender to put ON weight and allow me to consume the extra calories conveniently.
I use a Magimix Le Blender. Aweseome bit of kit.