I had Wii party for the original Wii which was a blast and I was expecting the same fun with this iteration. But sadly, this version of Wii party for the Wii u just didn't seem as fun. The games are plenty and some are intuitive but the ingenuity and originality that I saw with Wii party and even Nintendo land for Wii u did not seem present in Wii u party. My sister and I played this just a few times and now it's sitting on the shelf and collecting dust. There was nothing inherent in the game play that brought us back so in that regards it seems to be more suited as a rental. On the plus side, you do get a Wii motion plus remote with the game which is nice if you don't have four Wii motes.
If you're deciding between this and Nintendo land, I would say definitely go with Nintendo land, there's tons more originality and replayability. I'd only recommend this to die hard Wii party fans but be warned, this game seems to have a lot less content and allure then the previous version.