Given the choice between sitting down at my consoles/PC or playing a Vita game I would always choose the console. That gives me the bigger screen, surround sound, and a better controller.
PS3/PS4 games also have the potential to blow Vita games out of the water graphically too. Many games (indies, the Rayman Series, Sly Cooper, etc...) look at play identically on the PS3 and Vita. It is capable of putting out some beautiful graphics when the developers go for the right art design. Games like Uncharted that go for a more realistic look don't do quite as well. Don't get me wrong, Uncharted Golden Abyss and Killzone Mercenary are two of the most graphically impressive games I have ever seen on a mobile device (alongside Rayman). They just don't look quite as good as Uncharted or Killzone on the PS3. You will never see something that looks as good as The Last of Us on the Vita unless you are using remote play from the PS4.
So basically this is my long winded way of saying, of course modern home consoles are better way to play games than a Vita. That still doesn't stop me from saving almost every game that is identical on both platforms for the Vita. There are a lot of situations where a mobile gaming platform makes sense. I have lots of other things to occupy my time at the cabin but it's still nice to play a little Hotline Miami when the rest of the family has gone to sleep and there is no TV or internet. I spend a lot of nights in hotels by myself. I don't watch a lot of TV outside of specific shows so surfing the basic cable channels in a hotel room has 0 appeal to me. I like to read but outside of that it comes down to screwing around on the iPad or playing something on the Vita. A lot of times I choose the Vita. I like to play on the Vita while I'm watching a random baseball game sometimes too, whether it's a native Vita game or a PS4 game via remote play. I could go on and on but the point is there are a lot of times where I love to have my Vita around.
I rarely feel the need to buy a game. I do get certain specific ones I want to play but PS Plus gives me more quality Vita games than I have time to play in the situations where mobile gaming makes more sense than sitting at my console/PC. I think I would still be happy with the Vita even if I never spent a dollar buying games for it.