"Its a well known fact that Google bought Motorola only for the patents. Google has also managed to use the patents to sue other companies including Microsoft."

Really? Which suits were that?

Google has never sued another company over patents. They've made counterclaims when themselves sued, but claiming otherwise is just a fiction.

And they bought Motorola because Motorola was threatening to start suing all of the other Android makers, causing infighting that Google didn't want. So Google bought Motorola....to stop those patents from being used to sue, further diminishing your point.

On the whole, Google is very much the good guys, and Microsoft are very much the bad guys.

However I will say it is naive to assume this will continue forever. There was a period where Microsoft seldom threatened anyone, and we all held quaint notions about all of their "defensive" patents. Situations and markets change, and suddenly desperation takes foot and the company that was hugs and kisses becomes claws and kicks, so I would never assume that Google will always be a fairly good citizen. It could change.