10. Panorama view. This feature isn't out yet (early 2013), but my goodness look at this http://www.youtube.com/watch?v=Yj5K4a_-td
9. Media Hub. It's handy to use the touch screen to search through Cable, Netflix, Hulu, and Amazon Prime videos. When Mii TV comes out, it will be even better.
8. Miiverse. The Wii U's online community developed very quickly into a friendly, helpful, and polite place where people share amazing drawings. It's decidedly different from the ultra-competitive, insult-heavy and profanity-laced communities you might find elsewhere. Again, this is a feature that for some people is a good enough reason to buy by itself.
7. Quality and Reliability. How many of you out there still have N64's that work fine? How about SNES's? This is as opposed to other console's owners, who are very familiar with phrases like RRoD (Red Ring of death).
6. Multiplayer. Nintendo's known for games that are a blast with a small group, and that even non-gamers can join in and enjoy. Nintendoland has several minigames that are awesome for this - especially Luigi's Mansion and Mario Chase.
5. Party of Five. The traditional 4 controllers, plus a GamePad, means 5 people can play at once. Not everyone will care, but if you sometimes have a fifth person who wants to join in, this can be a big deal.
4. I'll be over here with the GamePad. Unless you have a TV all to yourself, there will probably be times when you want to play but other people want to watch TV. Many (not all) Wii U games are designed so that you can play entirely on the GamePad screen while the TV is on to something else. For some households, this might be the deciding factor, period.
3. Family friendly. Major games not coming to Wii U are things like God of War and Gears of War - which are impressive, but I wouldn't play them around kids. Wii U does have scary/violent games like Zombi U and Ninja Gaiden III, but it has a great many games that are great for kids (or at least won't traumatize them).
2. The second screen. This offers so many things already, and so many possibilities, that it deserves another separate entry. You can play 2 player without splitscreen. You can use the touch screen to do things like assign blitz or hot routes in football games. Games can hide information from some players while giving it to others. Maps and inventories can be on here without stopping the action or clogging up the screen. It doesn't have as good a display or multi-touch like my Kindle Fire HD, but then that doesn't have a full controller with dual analog sticks.
1. Nintendo's Franchises. New Super Mario Bros. U is already out, and it's fantastic. And there's still a whole lot to look forward to: Wii U versions of Zelda, Metroid, Mario Kart, Star Fox, Smash Bros., Mario Party, and many more (Rayman Legends also looks unbelievable). You won't get these on any other console or PC.
Nintendo didn't set out to compete with cutting-edge PC's, and that's probably a smart move. The next systems from Xbox and Playstation will likely be more conventional. Suppose they are equivalent to the best gaming computers from 2011. They will start out weaker than top-of-the-line gaming PC's, and only fall farther behind with time. Instead, Nintendo put its chips on offering unique experiences.