Let's put it this way... if Google hadn't bought the PageRank algorithm from Stanford and put years of work into perfecting their search results, Microsoft wouldn't have any way to track which Google search results users click. It's an unfair tactic that clearly demonstrates Microsoft's sketchiness and desire to monopolize themselves (by any means necessary, "evil" or not) wherever there's a computer.
As for the fanboy comment... I'm certainly not a fanboy but I'll let the following speak for itself: Microsoft Internet Explorer vs Google Chrome
From a search engine user's point of view, I believe this whole fiasco is ridiculous. First, it's ridiculous because Google is handling this situation very immaturely. Matt Cutts should not have confronted the VP of Bing in a way he did. Second, if I were the user of the Bing Toolbar, I gave permission to the Bing Toolbar to use my behaviors to polish my search results. I have no problem with that. Lastly, the experiments they did has more to do with "guessing what user wanted" than "what PageRank does".
I've used Bing fairly often past 6 months because of too many spams Google search results were giving back. Now that Google has fixed (or still working on) the spam problem, I'm starting to use Google again. However, what I noticed from the past 6 months is that Google search isn't so much better than Bing. This Bing Toolbar fiasco only applies to synthetic queries that I would never make.
Is Bing cheating? I don't think so. To me, they are just using another signal from user's permission. However, the definition of cheating will be different for everyone else.