Nintendo IPs don't really interest me anymore and Nintendo IPs and some niche Japanese games are all the games the 3DS seems to get. The Wii U seems to be in the same boat and I think that's its biggest problem. Nintendo needs to branch out and make new IPs to try to appeal to a wider audience.
If the games that Nintendo is known for producing don't appeal to you, then no, you probably shouldn't acquire a Wii U. If their style of game isn't your cup of tea, there's nothing wrong with giving their current hardware iteration a pass. Different strokes for different folks.
It is important to differentiate this distinction from the quality of the system, or from "IP" as you put it.
Looking at a hardware platform separate from it's content offerings will tell you about the quality of it's design. In this regard the Wii U is at least above average. The biggest issues it has are in its on-line server and interface features, and some of the more annoying quirks of its firmware interface. All of those flaws can be fixed or at least refined post-launch through software updates. Expected improvements and refinements to its on-line services are both possible and likely. (though it could take them awhile) As a hardware platform for playing games, the Wii U is a very quality system. The design is stable and performs well. The gamepad behaves as expected, and offers numerous gameplay possibilities. It's a fine system. The issue at the moment is that it simply hasn't gotten very many games. (and only a few of those have used it's features properly)
The IP issue is also one to be cautious in defining. Nintendo's IP doesn't have to appeal in order for their games to work. Nintendo uses their powerful IP as a way of enticing players who are either young, or grew up with Nintendo when they were young. And in that regard it works quite well. But the real development strength of Nintendo has been in core gameplay experiences. They simply use their IP as a coat of paint for these excellent mechanics. We've seen numerous examples in the past. But it isn't the Mario/Zelda/Kirby veneer that makes these games exceptional. They stand just fine on their own. Give them a different IP and they would still be great games.
Most people who are clamoring for new IP are just looking for a new veneer more in keeping with their current tastes. This is a short-term solution, and not really worth pursuing.