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I already have Genesis and it's great, i cant stop playing it. But i also wonder what MOTBW offers beside graphical enhancements. Is there a reason to buy that game?
This question / problem has been solved by Gremlionimage
They plan to release big patch, ETA around October, so I would recommend to wait for it.
Or wait until they fix everything that would be broken by October patch :\
They promise new content and "new functionality".

Currently there is no point, if you can play in Genesis without problems.
Try this mod for new content
By default, MotBW's single player campaign is the same as that of Genesis but unfolds much more quickly, so if you are finding the campaign length to be an issue then it may be worth trying MotBW.

There are a few additional bits of content such as special shard properties and desert provinces, although those could probably also be modded into Genesis.