Secret best system. My goddamn desert island console for sure. What it lacks in the almighty exclusives it more than makes up for in catalogue quality, functionality, quantity and value. Although I speak more as a fan of indies and old school japanese titles and not so much this moe moe dungeon crawler/titty brawler garbage that it's plagued with. You can play PS One, PSP, and Vita games (which includes a huge selection of PC & PS4 indies) and many times at no extra cost because of PS Plus or cross-buy (assuming you have a PS3 and/or PS4.) As an accessory to PS4 you can remote play, watch streams, cross-system party chat, continue cross-saves of applicable console games, use it as an additional controller, use PS Now... They even have the PS TV down to around $30 now at most places if you want to play Vita or remote play your PS4 on another TV.
It's really too bad about the memory cards. It's a massive barrier for so many yet the Vita practically ought be included in the PS4 box for what a fantastic companion hardware it is.
Also, fuck you Nintendo. My Wii U and 3DS continue to gather dust.