The camera is quite responsive, I am glad. Actually, I found that the faster shutter did not really compromise the brightness. Today is only marginally brighter than yesterday.
In time to come, whether you shoot in Aperture/Shutter Priority, Program or Manual, take time to vary the various metering modes (ESP, Centre-Weighted, Spot) and watch the how the shutter speed & aperture values change to get an idea of light levels in the scene then choose an appropriate exposure combination of aperture / shutter speed / ISO from the values.
I'm in agreement with Tomcat suggestion to use custom white balance option to get accurate colours from your shooting. I retract my earlier statement to do manual WB for now unless for indoor shooting. See (pp97) of the E300 manual. This approach is appropriate when the lighting condition is likely to be maintained for the duration of the shoot, it's somewhat troublesome but Oly's made it straightforward and the results worthwhile. Take time to learn this valuable tip from Tomcat.
Althought the E300 sensor is rather forgiving of underexposure & a bit of overexposure; when you can, explore the histogram (pp113), it'll give you an idea whether the camera sensor is capturing all available light in a scene at its fullest potential for the best image quality.
Anyway, I noticed an improvement in the strength of the colours despite the presence of colour cast due to the WB setting.
I too found that my handholding isn't quite steady & affected the resulting image quality (under low magnification), even at shutter speeds I considered fast or following the reciprocal focal length guide. I'm practising steadying the camera in my hands still.