Anecdotes is better than pure opinion. They can be poked at and questioned as any other unreliable evidence, and has a place in discussions (if somewhat far down).

However, saying "I _liked_ Silverlight" is not an anecdote. I can't discuss it, poke or question it, as it is without doubt true that you do indeed like Silverlight. As substance for a discussion, it as empty as it can be. At best, I can ask you to write a new comment which explains why you like Silverlight, in which you maybe then end up using anecdotes to support your view. That would then be the actually comment of substance, in which debate, research and discussion might flow from.

In the hierarchy, "I like X" and "I don't like X" is at the bottom. As such, my "ideal" is that comments should indeed strive to be above the lowest of the lowest, even if that means just going a step above into the realm of Anecdotes.