>>382735281
Example of a currently popular OP we tried during EU PyPy last Wednesday:
https://www.youtube.com/watch?v=gNn9NxZH2Vo

There's parts of a choreography, but the camera cuts force you to invent the missing parts, the dancing character rapidly changes position and pose, you don't know where to look, and it's too short (~60s vs. 180-240s). Also, it's very slow.
Absolute banger, though.

>>382735469
MMD songs tend to have the same proble, as described above. The dancers are also supposed to depict great dancers, and the songs are accordingly hard.

>>382735592
I like Fitness Marshall once in a while but quickly get fed up with it, too, but I can absolutely see why people like to play his videos. 
Like with Just Dance, the perspective is fixed, so you can concentrate on recreating the moves. The choreographies tend to be more intense and workout-like, yet they also offer an easier version of the song, if you dance the moves of the background dancers. Also, his personality is fun, if you are fine with the flamboyancy.