I'd say its totally personal taste. I actually like (and when I say like, its relative - I'm not comparing it to 'real' food!) some of the meals like the spag bol and the shepherds pie and even the carbonara. I couldnt bear the shepherds pie three years ago - its changed.
I just tried the risotto and its grim though. I don't like the chilli much either.
First time around I tried the tomato soup and that was also rank. My fave was the thai chicken. I try to avoid the soups though. Prefer meals.
As far as the shakes go, the worst imo is the chocolate (synthetic tasting) but I like the vanilla as I can add coffee. When I can't face another bar, I replace it with a 'treat' (ha ha) bar - an atkins peanut chocolate. I have to be careful though as the taste of chocolate makes me crave the real stuff.
The oats as porridge I find inedible - I always make them into 'biscuits' and eat them that way.
I made a mousse last night with the vanilla milkshake and baileys coffee. It was actually quite nice!