@Sarni, I get the impression that you buy
every game that gets released pretty much on day one... but you keep calling yourself a casual gamer. That's not casual by any definition...
Your game collection must be daunting...
I play a lot in my spare time but to be fair I do get plenty of games day one and then not complete them for weeks or even months. I like them sitting on my shelf.
I used to have a big collection of PS2 games but sold most, I still have PS2 in one of the rooms but I barely use it. On PS3 I got mostly digital games - around 60-70 of them I think, half of them were PS+ freebies and half were bought on various sales. I have about 10-15 retail copies too.
I got most of the retail stuff that's come out on PS4. I'm yet to buy Thief (had it but sold it), Tomb Raider and Lego Marvel and that'll be about it in terms of games that have already been released and aren't crap. This time I've completed most of this stuff or got plenty of playing time out of it though.
I have pretty much 90% of full titles and most indies that have been released on a Vita, all of them digital because it's way more convenient that way. Same case with 3DS - got pretty much all there's interesting, this time all in hard copies.
I don't think I've completed more than 50% of games that I own though, perhaps significantly less than that - especially my PS3 backlog is huge because I'd start PS+ games and not finish them and buy plenty of stuff for €4 or €5 when they were on sale.
Casual might not be a good word for it, I just play games for gaming experience and don't go into details of technicalities.