Yes! I never really liked the taste of my beer post fermentation. But 2 or 3 weeks and some carbonation makes a world of difference. The brew gets even better when you let it condition a little longer (say a month or so depending on the style). What kind of beer is it? Some styles of beer don't come around for 6 months or more.
Give it time and let the yeast cleanup after themselves and let the flavors meld. Your patience will be rewarded.