I don't know about the Cuisenart, Greyduster but the MR blends in fits and starts too, with heating in between. I suppose the carrots or whatever cook faster when broken up a bit. How long was it supposed to take, and how long was it in reality? The MR takes 21 minutes for smooth carrot and coriander, and the carrots are certainly not cut as thin as you say.
The flavour is up to the recipe, as you say. For 1.2 litres of soup I use 600 gm of carrots, a small potato and a small onion (unless it is for Sil with IBS - he doesn't eat onions) The seasoning is a good heaped teaspoon of ground coriander and two or three of Marigold bouillon powder. It doesn't taste bland to me.