Not necessarily, Signal quality is usually some sort of useless percentage of what, nobody at Cisco can answer. SNR on the other hand is Signal to Noise ratio. This is a quantifiable number that refers to where your signal is in reference to where the noise is. SNR is measured in dB as well. If your noise is -88dBm and you signal is -65dBm, then your SNR is -23dB (which is good depending on what your doing with it, voice would probably work depending on whose it is etc...)the lower the number the SNR is the closer your signal is to the noise. Think of your car driving around until the radio station starts to drop off. If it's a really good song you will put up with the static so long as it isn't unbearable. When it becomes unbearable you will find something else to listen to.
Think of -25 to -30 as very good (depending again on environment etc..just a guide not a rule), -18 to -20 ok, (VoIP might be giving you problems but your data probably still works) and anything lower than that is pushing it.
This is not to say that signal quality is useless altogether, it must be looked at in conjunction with signal strength and SNR and the environment it is in etc... in order to give you a picture of what you have or what you think you have anyway...
