Melissa certainly inspires varied opinions! However, the opinions of the 'powers that be' at ABC are the only ones that matter in this case, and apparently they have a very high opinion of her indeed. They don't hire new talent on a whim; too much $$ involved not to take a good look and do a good analysis of what they're bringing in.
Melissa isn't "polished" and I imagine that's one of the things they like the best about her. She could be any of us. I love her Cinderella story, but it's not all luck by any means. She's got potential or the big guns would have just thrown her to the curb like they do most of the other reality contestants (not to mention any names, lol.) I think this is probably the true beginning for her and she'll go far. Good for her!