pigdog I'm sort of with you! Put the fish in a barrel and give me a shotgun please!
However, actually a lot of games are like that anyway if you just persist until you get good. Just get out there and die a lot! Become expert at losing and be proud of your rare talent! Heck it's only pixels. Everyone is like you. We all learn just one thing at a time.
Of GoG games, Heroes of Might and Magic 3 Complete. Developers could have made a better game since it was released, but Developers obviously have not! Turn based game.
Run Tutorial a couple times to get mechanics and icons straight. Play some random maps. Play lots of random maps. Heck, all you need do is play random maps! Stick toe gently into shark infested waters of the Campaigns. Eh, not really! Campaigns and scenarios to last a life time. Stay on Easy and be a tourist or don't.
Watch videos of play throughs of any game on YouTube before buying. Most are up there.
http://www.youtube.com/watch?v=WiYvdkCDFC8&feature=related boardgamergirl play through of HoMM 3. Play through alive and still in progress. Only need to watch first two or three. She is good instructor and speaks well.
http://www.youtube.com/watch?v=EplLyekzMFA TheMeinTeam play through of HoMM 3. Play through alive and still in progress. Excellent player and instructor. TheMeinTeam also plays Civ Series, StarCraft 2, and others. Guy is brilliant. Other good videos on HoMM 3, too many to list here.
Watching game videos on YouTube is a game in itself. Find out who TotalHalibut is. He covers a wide variety of new games with a good introductory video. Aka TotalBiscuit The Cynical Brit, this guy is a hoot!
Of non GoG games, very lot of newer games including online games that are not only not very demanding but can be played while asleep or seriously decomposed by spirits. That is the wave of the future for gaming I think.