Just remember the phrase "You can't polish a turd"
Unless you're recording in a room where you think the ambiance is amazing then it's probably a better idea to run it through a reverb unit/vst and play about with the settings. If this doesn't take your fancy then just play around with different mic placements around the room. You'll find that different spots of the room will have a different character, like one spot will have a lot of resonance and it will sound quite dark, and another will sound quite bright and so on.
Basically just don't be afraid to experiment