I doubt that more than maybe 5% bought the PS4 because of all the Indie games which have a Meta above 80 or that these games were the reason to chose a PS4 instead of an XBO for more than a few people.
PS has simply a lot of fans and PS3 would have sold also much better as 360 if the price wouldn't have been so high and if PS3 wouldn't have released later. But because of that high price and later release, many bought a 360 and because many already had a 360 then, many others bought one as well to play with friends who have one. 360 was also known to have an advantage against PS if it comes to online (party chat and so on). Not sure if there is still one on XBO but it is surely much smaller this gen.
That Nintendo's console is selling not that much is because casuals aren't jumping on it like on the Wii and without them Nintendo does simply not have so many fans who will buy their home consoles. Tthe lack of big games like Fifa or Battlefield hurts as well.
PS is selling so great because there is no reason for PS fans to buy something else as long as Sony will do what they always do and because they sell the strongest hardware for a good price so that many people who don't care about the company behind it and don't even care about much more than CoD or Fifa or the latest game from TV ads will buy the PS4 simply because they read/heard that it's the strongest hardware but which isn't really more expensive as an XBO.
Another reason why XBO is selling so much less is obviously that they didn't really do a good job last year and there are still many who have that in mind. I just have to think about what a scandal it was in Germany (reports in huge magazines like Der Spiegel) that MS gives informations to the NSA and that XBO has a camera which could theoretically spy on you. Was a big thing here and since the whole NSA scandal was big here I'm not surporised that XBO is selling so bad in Germany.
Not to forget all the other stuff which didn't work out very well for them and their reputation.
