I for one agree with this review. I do notice that the sound when right in the sweet spot is fantastic and there is a noticeable difference when moving to the front right or left position. Now, do I think it's "bad" when off-center? No, not at all (and I don't think that's what the review indicates either). It is simply not as good as it is dead center.
I should preface my comments by saying that I do not have a professionally trained listening ear, and I didn't listen to dozens of different speakers before making my purchase. I have to imagine that off-axis sound is always worse regardless of the manufacturer, but I didn't listen to enough other speakers to tell you how much better or worse Axiom is than average.
So, in summary of a long post.
The VP-150 sounds tremendous when listening in the sweet spot. It still sounds quite good when listening off-axis, though to me there is a noticeable difference. This does not affect my happiness with the speaker. I would buy it again (and may in fact do so in the future to add a second below my screen at some point in the future) 
