It can be a lot of work to get a great sounding mix, other times, not much work is involved. I would play a commercial CD thru your speaker system, and compare the Genos EQ's and relative levels of each instrument. Like Tommy said your room, speakers, placement, etc, shape of room make a huge difference.
I don't particular care for Genos drums. I think they are perfectly fine for live performance. I record, each drum instrument seperately into my DAW, I often use different drum programs, or Drumagog, a drum replacement program. Other times the Genos drums sound the same.
You can do individual things to separate drums, lo end roll off, notch, hi filter, change pitch of one drums. Sometimes you can just use the Genos straight, and run a mastering strip on the final output.
Yes, using Genos limiter, and EQ can greatly change the qualities. In general I think Yamaha are the best company for making their arrangers, sound fine, and homogenous.
Music, like any other instrument, profession, etc - you can get reasonable good, but you spend the rest of your life refining, and perfecting your craft.