Because paying off debt doesn't actually improve your situation in one way or the other.
The money you have is likely making you money, so interest is generally very small, especially in corporate examples like this, the agreement doesn't happen like it does for us measly citizens. Companies have clout.

Of course, sony has a very bad credit rating so is likely paying higher than most others. But even so, sometimes it's better to have money lying around than to give it to someone else.

If I owe someone 1,000 and I have to pay 30 dollars a year to have that 1k in my pocket. I will keep that 1k for as long as i can.

Revenue is more important

Sony: ¥8.215 trillion which is US$ 70 billion
Nintendo: ¥549.780 billion
Microsoft: US$ 93.58 billion

I don't know who told you that.

Debt is a liability.
It is factored into total liabilities.

You could have just googled it before you said it.

it tells you everything 

lel

kowen take it easy.

Ruler, please believe me when I tell you that revenue is next to no importance at all. 
All it means is how much consumers have spent on your goods.

You can make a 5$ watch and sell it for 5,000
And someone can make a 10,000$ watch and sell it on sale for 5000 because he's liquidating and shutting down.

Revenue would only tell you that 2 people bought watches for 5,000$.

Yes it is. It's right there

http://www.marketwatch.com/investing/stock/sne/financials/balance-sheet

Included in the "Total current liabilities"...

Sony is god, PS4 the saviour!!

Wouldn't we better be comparing only game divisions? (at least now, until Nintendo enters with the mobile market and movies and series and theme parks, etc)

We don't have numbers for that.

tell that to GM now