The issue with console-style games on a handheld is that you have to ask, "Why didn't they just put this on a console?"
Being able to play Wii U games on the GamePad is merely a perk to the console experience. If I want to play videogames and someone else wants to you the TV, the option is still there.
But what exactly is wrong with playing console-style games on a handheld? Isn't it good that you can have the same gaming experiece wherever you go?
Playing games like Mario Kart, LittleBigPlanet, God of War, Metal Gear Solid, Uncharted, Assassin's Creed, Ocarina of Time, PS All-Stars, Smash Bros. (etc.) at home or on the go is great.
Sony even gives you the benefit of cross-platform play, allowing you to play the same game wherever you are and have your save files linked. The Vita is an amazing handheld, and it's a shame that it isn't selling well.