To give you some examples of the characterization (and further explain why the writing hasn't impressed me so far)...
Mercury's not particularly egotistical. He's just a jerk. And obsessed with Douglas, Robot Hunter. Gold, on the other hand...has become a walking ego. In issue 2, he calls himself 'The World's Greatest Superhero'. And seems genuinely shocked when Tina is kind of gobsmacked by that. Copper's only consistent character trait is being so forgettable that everyone - including Doc and Tin - are quite able to forget she's there, sometimes while talking to her. In issue 1, Tina actually manages to do so while defending her. That got old real fast. (About the third time it came up in issue 1.)
Iron has barely showed up, and Lead isn't too bad...certainly better than the glacial slowness of the version in that Superman/Batman arc with the OMAC.
They, Tina and Tin all have their dominant character notes intact, if not always executed well (Tina actually comes across as a vaguely dangerous stalker, not an annoyance), at least.