...What are you talking about? Last I heard there were only a couple of games with major issues left in N64 Emulation on the pc. Most games I've tried on the Nook color ran very well, not 100% all the time, but completely playable (then again, why anyone would want to play through Ocarina of Time on the Nook Color is beyond me.)
Well I'm guessing you haven't tried very many games. There are many with problems even on PC, necessitating using multiple emulators and plugins. And of course there are 5 or so that used custom RSP firmware and basically don't work at all (although some of them can be made to partially work with some workarounds and hacks).
Some that I can get working on PC won't on N64oid because I can't try different video plugins.
On my old modded Xbox I have Surreal64 (it is still being maintained). On that they have multiple emulators and plugins ported. You can choose from UltraHLE, Project64, and 1964. There are 4 video plugin choices, 2 audio plugins and other options. That is better than N64oid but PC is best of course. Xbox is also somewhat faster so runs more games better although its 64MB RAM is inadequate for a few.
N64 emulation needs more low level emulation to get past all of these dirty hacks that are so problematic. But that is more demanding than HLE so wouldn't be good for weak devices like phones and tablets. It is in the works in MESS for example but they go for pure accuracy instead of any reasonable playability. A middle ground would be nice but nobody is working on it AFAIK.