It's a pretty silly argument to say that Google have been unfairly singled out, and quite wrong too. The companies that you mention have all had their share of regulatory intervention, especially in the EU. Your first example, Microsoft (exactly who was inconvenienced by their OOXML standard?) is the first company that springs to mind when thinking of EU intervention. Remember the browser choice screen or the two billion dollars in fines?
They are also keeping their eye on Apple in the eBook market, although I maintain that the consumer has benefited from Apple being able to strong-arm the record industry on removing their DRM. Facebook's privacy problems have also been the subject of scrutiny in the EU. And for Oracle...
No, I can't bring myself to even appear to defend Oracle!
So the idea that Google should be given a free pass because they are being unfairly picked on is just rubbish. That doesn't mean to say that the EU's complaint isn't without issue. The fact that Google displays links to its own vertical search services doesn't seem too unreasonable, and it is a practice that has gone on in the industry for years. I first saw this used by Yahoo when they linked to their own services in their results (eg. Yahoo Finance). And when I search for "microsoft stock price" on Google, I got links to an assortment of financial sites at the top of the results (eg. Yahoo Finance).
Similarly, when they include reviews or news from other sites, they always link to the source. That said I can see that there would be a concern if they show the entire news story or review which means that you never have to follow the link. I guess there is a legitimate concern about some of Google's practices, but I am wary of the heavy handed, simplistic approach that the EU regulators sometimes utilise.