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a bad bearing in the alternator could be causing the rattling sound that you hear. remove the alternator belt and start the car and see if the noise is gone. if it is, then the alternator is the culprit and needs to be replaced. but no, the alternator has nothing to do with power output. an alternator only supplies the electricity that runs through the car, from spark plugs to radio, etc. a car can even run without an alternator for a short while, running off battery power alone, as you will see if you attempt the diagnostic I suggested above.
the hissing noise is most likely a vacuum leak somewhere, and is also probably related to the loss of power. try to locate the source of the hissing so that the leak can be corrected. chances are that the vehicle will return to its former level of driving power once the vacuum leak has been eliminated.
as for the change in exhaust noise, who knows. get the other two problems solved first and then see how it sounds. generally though, exhaust noise tends to get louder, as the exhaust system degrades over time (or gets damaged by rough driving).
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