Because no one's happy unless we all really hate something we know nothing of except some screenshots.
When you have played as many games as I have, for as long as I have, with a development background, and experience with unity, even a single in-game screenshot with interface is enough to determine a *lot* about a game. It could still have a good though, but that won't keep people playing it for months. If they integrate this somehow with a persistent universe it could still have real potential, but if the megemak developers decided to just add a 3D interface to their own system it'd be much better.
Recording a series of turns isn't exactly hard by any means. 3D at that scale is fairly easy in most ways, though weapon effects can be tough. To me the hardest thing about this would be simply making the models/animations and artwork. If we had, say 20 or so low poly animated battletech models I can assure you that we'd already have a 3D version of megamek.
Another thing to think about. Look at the Dawn of War games. They were *awesome*. DOW2 I actually still play online occasionally (last stand mode is to die for!). Its a pretty simple engine, with great animations and models, and overall the game is pretty fun. Not quite moddable enough IMO, but great nonetheless. Now, compare that to the tabletop game. Right, pretty much nothing is the same. Its a great game, but it is *not* a copy of the tabletop game, just in the same universe.
Crossing my fingers to be wrong, but the best this can be IMO is mediocre, but since it is browser based *and* free the audience should be considerable, which is a great thing no matter the quality of the game.