I think it definitely needs a tutorial or walkthrough of some sort. I only ever get dodgy looking words that aren't memorable in any sense, in fact would be extremely difficult to say over the phone. I am guessing it's the way I'm using it but I don't know any better! :)
Sorry to hear that. There actually is a tutorial/guide referenced a bit lower on the page but not many people seem to see it, may need to emphasize it more!
Maybe try the basic word maker to make words starting with 'arb,' 'orb' or 'mar'? I've found the words those generate are fairly nice as an idea for what it can do. Also maybe try shorter words?
Dunno. To be honest, having used the other name generation tools, this is the one I'd use to get a new domain name and a good amount of people have found names they like through Namebird (someone put in starts with 'pay' and got paydrow for instance and I used it to name itself too :P).
It looks like a really good tool if (and I'm assuming it does for others) it works nicely, I'm just missing that moment of 'click' right now where I grasp how it works. Going by what you've said I think I was more using it as "here's a word, do more with it please website robot" - I'll have another play! :)