MOF was developed by a smaller division of mercury steam. Also, the 3ds has sold fewer units than the DS. And LoS is the highest selling castlevania game. So there is that to consider.
well let's be clear, MOF was developed by about 25 people, about 20 of which were quite new to the industry, first game. They were looking for talented people to form it and join the company, because the company's main division working on LOS2 (to be exact not in the game but in the Mercury Engine 2.0 and the new develop tools)
This was the first big error.
Second error was, they tried to do it fast, so no graphic engine developed for the 3DS, took the XBOX360 and the were adapting and reducing until it was playable ..
Third mistake, the graphics engine conditioned the combat system and the visual aspect of the game, when they saw that the game does not see anything wrong with the 3DS decided to make a game similar to the 3DS LOS but we all saw the result, it is bad but is perfectly forgettable.
The worst thing is that it was originally planned to do a 2D game with 2.5D scenarios, it would be simple, so the new group of people would not have many problems, but changed their minds thinking it would be just as easy and emerged thousand problems ..
In summary MoF development itself was a mistake, because they not did the right people, not dedicate enough time and chose bad game characteristics (technology, combat system, etc. ..).
But these things can be learned, this can happen to anyone.
It's like the first two chapters of LOS, there is not a single MS worker now tell you FUCK, that if any had changed something with more action, history and intrigue. They wanted so much mystery, history and advance so slowly that exceeded.
So while LOS2 is as long as LOS1, the feeling is that last twice, because there are no "dead time", any time or scene is important, everything is transcendental to the story, there is much to tell and so little time (even in the tutorial xD, as we saw in the demo).