I have been chipping away for the last few weeks giving the Sega Genesis/Mega Drive the same treatment as with my SNES genre fix and backgrounds.
I have edited genre information from @SupraKarma's xml from the Ultimate Sega Genesis Pack.
Basically if you want to use the Genesis/MD genre function it's worth grabbing this xml. I've included with the zip the xmls already split by genre and also a handful of useful xmls from SupraKarma's pack such as coop, exclusives, multiplayer etc. Everything has custom backgrounds included.
My approach to this xml was more thorough than when I originally went through the SNES xml which I fixed in order of worst offenders to least genre wise.
This time I went through from start to finish and judged every title individually based on video, wikipedia entries and other lists and resources. The occasional game I loaded up to play a bit to be sure. My results went back to the SNES xml in cases of multiplatform games and that been tidied up a bit and re-uploaded for consistency, the link is below if you are interested.
Roughly what has been done:
This XML was the opposite of the SNES in the case that a huge amount of titles were assigned to 'Platform'. Randomly every 20 titles or so something was assigned to 'Platform' that was just in no way shape or form a platforming game. Many titles were also moved to more appropriate places - usually 'Action'.
The 'Shoot em up' category was filled. Previously they were in 'Shooter'
'Educational' was added and the correct games assigned.
Many games were assigned to 'Adventure', generally 'Action-RPG' type titles which have less emphasis on stats and strategy.
'Arcade' was added. Titles that were ported from arcade versions, classic arcade compilations or even newer titles that have arcade type gameplay (e.g. fix it felix). Beat em ups that qualified for this however were left in the 'Beatemup' genre (e.g. GoldenAxe)
I opted to move the flight sims into it's own category 'Flying' (in staying consistent with the snes xml) as there were enough titles to warrant it's own category.
Numerous other corrections which I've forgotten.
The Sports categories for the most part were correct as were Beat em ups, so thanks to whoever put that work in. I did opt to remove some categories from sports such as bowling and skating and move those titles to the general 'Sports' category as they only contained a single title. I also removed the compilation category and assigned those to relevant sections.
Thanks again to @SupraKarma whose awesome Ultimate packs have inspired this work and also where the xmls, wheels and sports category backgrounds are from. The Ultimate Sega Genesis pack is linked below.
Below are links to the Backgrounds that accompany this xml (though they are included in this upload for convenience) and to my SNES genre fix.
Please let me know if i'm missing anything in the upload or anything doesn't seem right. Enjoy!