Can't believe anybody would dislike Rhino, particularly in favor of Mag. Mag is great against low level enemies and is definitely fun to play, but he's squishy, and he certainly isn't a heavy damage dealer. Rhino is a fully badass frame and his Iron Skin and Stomp are a devastating combo, even against high level enemies. If I need to solo a level, which I've had to do a lot of lately to open up the map (what's up clan?), Rhino is my frame of choice. And the Vanguard helmet...sogood.gif.
That said, I got Nova yesterday, and OMFG. I love her so much. Reminds me of playing Lileth in Borderlands...just zipping in and out crowds and dropping devastating attacks. I leveled her to 30 in a day, because she gets a comical number of kills with her Molecular Prime ability and with Flow/Streamline/Stretch. In one defense mission last night, I had over 900 kills. I also really dig the teleport for getting in and out of tough spots. My only beef is that her two polarity slots are "V", and I don't find myself using V polarity mods on my frame other than maybe Focus. I think I'm going to have to forma her today to change a V and probably again later to ditch that ball power.