I've actually seen all of these units used successfully except maybe bcs and some in high level play, though I would agree that a lot of those units need tweaking. watch hdstarcraft and huskystarcraft replays on youtube and they show off these units at some point
funny use of phoenix http://www.youtube.com/user/SC2GGRise#p/u/10/Tf9igV1e1Xo
funny use of phoenix http://www.youtube.com/user/SC2GGRise#p/u/10/Tf9igV1e1Xo