Sadly, Dundjinni will not make you a good mapper. I know because I'm not.
What it comes down to is that, with any mapping tool, it's going to be really difficult to make good-looking maps until you've put a lot of time into it.
That said, when such a time comes that I have the time to put into it, I will most likely put the time in with Dundjinni. I would like to add some color to the gaming table. Literally. I would like to plunk down some neat-looking color maps for my players to drop minis onto.