What is a MOBA and why is it fun?
I am not a big fan of RTS games especially ones where you have to be twitch fast. I really really loved Age of Empires Gold and will still install it on my system
MOBA (multiplayer online battle arena) is a game where small (usually 3-5) teams of players fight each-other on a relatively small map. Each player controls one character who gains levels and equipment through the game. In most, players start from opposite sides of the map and work your way through pre-set defenses toward their opponents' base. As to why it's fun, that's harder to say, but there is a competitive aspect and a cooperative aspect as well as tactical and strategic decisions and a little bit of RPG thrown in for flavor. If you are interested, most are free to play. The big ones are League of Legends and DoTA2, although there is also Heroes of Neworth, the Stardock-published Demigod, and many more. if you are looking for a more casual version and are a fan of Adventure Time, Adventure Time Battle Party on the Cartoon Network webpage is pretty fun.
EDIT: Also this genre started as a mod for a traditional RTS, so camera angles and controls are very RTS-ey.