Googorola won't be magically immune from litigation. Just this week, Apple just launched a new lawsuit against Motorola and another targeting the Galaxy Nexus which is really about Android 4, rather than any of Samsung's hardware.

What the Googorola merger will do is increase tensions between Google and its OEM partners which Motorola is competing with. If Google gives Motorola special access to Android development, Samsung could threaten to pull an Amazon, fork Android, strip out all the Google services, sell the search bar to Bing, and take half of Android's user base with it. If Google doesn't give Motorola special access, then what the hell was the point of dropping $6 billion big ones on it?

In many ways, this partnership is a lot like Microsoft and Nokia. That move also threatens the enthusiasm of non-Nokia OEMs. Here are the differences:

1. Microsoft paid far less for a far larger prize.
2. Nokia wasn't making any Windows phones, while Motorola was already heavily invested in Android.
3. A special partnership is less scary to a competing OEM than an outright acquisition.
4. With its tiny market footprint, Microsoft has a lot less to lose if they do alienate other OEMs. Android already has a strong market presence.

Meh, the agreement between msft and Nokia probably has a term of only two years or so with an option to renew if both parties want to move forward as partners, I mean if android starts to dominate significantly further, then Nokia would be very glad that it would have the option of jumping ship. Also, on the acquisition, this will allow google to finally have a hardware manufacturer, so that it can do things like:
-offer mp3 players with a $20 prepaid card for google music, to entice consumers from iTunes, and it would help google+ as well, since music is a big part of google+'s strategy
-give google a hardware manufacturer to make google tv set top boxes, so that google can have another way to advertise to upper middle class consumers
-add motorola's patents to its own and start suing Nokia for supporting msft, but they'll probably word this as abusing googorola's IP. And I realize that google wouldnt be immune from litigation, but when I search for terms like "google Motorola patent defense" and every article is saying that this move would significantly help its IP position, then I would have to agree with the consensus.
-give google an android exclusive OEM, for tablets and phones, which google just hasn't had yet

I also understand your argument about google giving its phones a better quality OS, but if this would be a bad idea that random people on a games forum realize it to be, then why would they do this?

1: MP3 players? It's a dying market already sewn up by Apple. Might as well use Motorola to go into pagers.

2: Google has already tried this with Sony and Logitech, and they're rumoured to be trying again already without Motorola's help. The secret to the TV market is to either get the blessing of the cable companies or to work around them somehow, and I fail to see how a Motorola acquisition will help with either.

3: Motorola has been on the rocks for a while, they weren't going to leave patent weapons lying around. Anything they have over Nokia, Apple, or any other competitor has already been launched. People know that Google wants patents, and they know Motorola has quite a few, so they figure that must be why the deal is happening, but if all Google wanted was IP, they could have licensed it, including the right to litigate with it, for a helluva lot less than $6 billion.

4: Why does Google need an exclusive OEM? Has Microsoft ever needed an exclusive PC OEM? No, because Windows was the only practical OS game in town, which Android was well on its way to being. iOS and Blackberry OS are unlicensable, Symbian is dying, Bada only exists in SE Asia, and Windows Phone can't even hold onto what's left of Windows Mobile. Most OEMs seem perfectly willing to accept Google's terms to license Google apps and develop "pure Google" Nexus devices. What further access does Google need to risk antagonizing all the other OEMs?

"Why would they do this?"

That's a damn good question. The only answer I can find is in Google's social strategy. This is just another strand of spaghetti that Google's throwing against the wall.