Works for me. I'm able to connect a piano / midi controller to a computer, and have it work with a musical web app in Chrome.

Admittedly, I don't do much other that get the notes played on the keyboard (MIDI code, time down, time up, and velocity).

Don't need much more than that to do a whole lot of interesting things.

it can be made to work, it is mostly not literally broken.

The web MIDI API? What do you dislike about it? It's pretty straightforward and easy to use.

well, last I looked:

1) you could eavesdrop on events from instruments and you could publish midi events, but you could not actually register the browser as an instrument or an output that could be seen by the rest of the midi ecosystem

2) binary abstractions that are not very javascripty leaked up into the js objects. I remember seeing hexadecimal MIDI frames in my console that I had to decode myself- no other web API does that