Massive Chalice is an interesting twist on the genre, though it does sort of feel like more could have been done to differentiate it. The game's style is good, and the basic structure is engaging and challenging. Combat could be a little more tactical, but overall it's a solid game that provides a great outlet for any turn-based craving you might have.
Mordheim manages to create a turn-based experience that is not quite like the now seemingly industry-standard XCOM but which finds its own way to tweak the genre. Aside from the jarring nearly-first-person perspective the game really does feel like a tabletop miniature game, complete with randomization and ability checks. And at the same time this is probably the most natural way to design such a game. Tabletop miniature games are essentially the original "turn-based" combat games. Making a digital version of one of the lesser known entries in the genre is completely logical.
After all of that, for a game like this which appears to be aimed solely at a competitive multiplayer audience, it's really a matter of how many people are playing it and what the metagame ends up looking like. If there are imbalances in multiplayer, how quickly are they addressed? How are they addressed? How healthy is the community? How quickly can you find a game? All of these questions can't be answered simply by playing the game once or twice, definitely can't be answered before it releases, and are dependent on a sort of ephemeral quality that some games have and some don't. I think there's potential, but there's not quite a resounding reason to play this RTS over the dozens of others.
The core of Sword Coast Legends has potential. The single player story is fine, but not remarkable, and the capacity for multiplayer is welcome but ultimately disappointing. The best thing about the game, seemingly, is that it's sort of like a set of tools that could be used (if you're ambitious enough) to create something very cool. The game just doesn't quite make it cool enough by itself.