"Das Personal ist schlecht."
Probably not if you think that 'mir geht es schlecht' means 'i feel bad'. In this sense 'the staff is not feeling well' should be something like: 'dem Personal geht es schlecht', I guess. For 'ill' germans have the word 'krank', so your sentence would be: 'das Personal ist krank'. I hope this helps a little. :-)
I take your point, Selphie. The frustration can be enormous at times but think that it's online and free of charge. (At least that's what keeps me going...)