I saw them in Pittsburgh a couple weeks ago. I think Axl sounded good. At least he’s singing live. Also, it nice to see if running around and smiling. It looks like he’s really enjoying himself out there.
In my opinion, Melissa's vocals are great. Her vocals do not over-power Axl's during live concerts, and she also does not "help save" Axl's vocals. She does back-up vocals, just like Duff, and Dizzy, and also like Tracy & Roberta did, back in the 90's. Online recordings are poor quality. Online recordings do not do the vocals (for either Axl, or Melissa) any justice. During live concerts, you can really hear how well their vocals mix :)