No, it's really not bad to eat frozen dinners. If it works for you, do it. No one is going to be nutritionally 100% perfect all the time. I did see the original post and the link and I think the concern was that most of the foods were processed and snacky-type stuff.
I had the same experience looking at the Hungry Girl website...lots of her tips are useful, but a lot of her suggestions have artificial sweeteners, which I don't like to use. So I take what helps and ignore the rest.
One could make the argument that eating according to the OP's plan (and I don't recall it exactly and it's gone now) and losing weight is better than the health risks of being obese, but it's true there are better choices food-wise.
I think everything in moderation is a good motto. That includes frozen dinners, diet sodas, occasional indulgences. I think that if you have a pretty good balance the rest of the day, the frozen dinners are just fine, IMO.
Bottom line is, nobody can tell you how to do your diet...because nobody is experiencing the results but you. I think the deal was that she came in to ask for feedback and then got upset when she received it. I don't see this as a somebody's right - somebody's wrong situation, just conflicting opinions and maybe the way both sides presented their opinions.
So don't pitch the Lean Cuisines