This is a hard question because Elemental is a better-that-the-sum-of-its-parts kind of game, but...
*I like the artistic style, both the character models and landscape look and feel.
*I like the idea of city building and linking them together into a network to create a "Sim" fantasy kingdom. While I spend most of the game zoomed out in the cloth map, once in awhile I like to zoom in, tilt the camera angle to nearly horizontal, and fondly regard my creation. Which reminds me: is it possible for mountain-tops to be spikey instead of round?
*I like the idea of restoring the land with influence and wish that had a bigger role.
*I like that it is not just another elves/orcs/dwarves/zombies game. I've played enough games that the only thing that excites me anymore is innovation, so I like all elements of Elemental which are new and haven't been seen before.
*In that I can put up with the music for an hour or two, I guess I have to list that as a positive. But for a game that lasts hours and hours per match, if we had something softer that fades better into the background, I might never have to turn it off. Just give it some thought.
*I like how the RPG elements fit into the strategy game. Adventuring can really benefit your economy. I like the little slot-machine style reward system you get from goodie huts. It's always fun to get random stuff. More magic gear would make it even better.
*I like how wandering monsters present a separate threat you have to deal with. I'd like more of that. I'd like to see this possibly used as a weapon, where adventuring techs can increase monster spawn throughout the world that your enemies have to deal with, rather than just you.
*Though I haven't used it as much as I probably should, I like the ability of using magic to change the landscape, to open passageways and create things like defensive bottlenecks.
*I like getting married and spawning my own heroes. That's a nice touch, and some have become pretty potent heroes in the late game. I like being diplomatic with the AI too, to influence them toward my interests and goals, rather than just fighting them. Even with a conquest victory which is 4 games out of 5, diplomacy still has its uses.
*I really like using diplomacy to recruit "intelligent" monsters. Niiiice.
*I like the mods, and Elemental's welcoming attitude toward mods. Any mod-manager tool would be great, and more modding tools.