I felt the Rose/Mickey situation was, like with many Rose-related things, handled superbly in Series 1 and then much less so in Series 2.
I enjoyed the angle they took with it, and how they made genuine consequences for Mickey after Rose literally disappeared. And to be fair in Series 1 it was a very difficult thing for Rose as well - you don't have spacemen in time travelling spaceships offering you the trip of a lifetime every day. And how many people would be willing to admit they wouldn't be tempted to just drop everything and go on an adventure with the Doctor, regardless of what you were leaving behind?
Perhaps again what worked better was that Rose's relationship with the Doctor was platonic in the first series. It didn't feel like she was mistreating Mickey per se. He went through absolute hell as a result of her disappearance, granted (Rose had anticipated only a days absence, the Doctor was at fault there). He then struggled to get over her and admitted he would always come running for her in Boom Town. She was taken aback by it all really, and even tearfully apologised to him in the moment. She ultimately chooses the Doctor though, and Mickey should have taken that as the final sign - the one at which he had to get ahold of himself and move on. In the finale when we next see him, he really does just come running. He's not over it at all...and that was pain-stakingly real. In Boom Town he's angry and he's done with her really. But that doesn't matter because she shows up again and he can run after her again...maybe this time? With the Doctor trapped in the future, his first thought when Rose obsesses over being stuck is the kind of future she can now have with him - at which point for me it was a case of Mickey simply not being able to move on. She clearly didn't have any interest at this point, she isn't stringing him along at all - with every fibre determined to get back to the Doctor - and he still pursued it. It's here he seems to actually accept it though, when Rose says there's absolutely nothing left for her at home.
Reach Series 2, and Rose's relationship with the Doctor became more romantic than platonic. And yet we had the nightmare scenario of Mickey coming aboard the Tardis as a spare part, a tin dog. Sure the show made that joke, but it was a joke that didn't need telling. It dragged third-wheeling Mickey through the dirt, and he became a laughing stock. They literally mocked him together, which in a way fed into my lesser liking of Ten and Rose.
Rose was in a tough predicament just like Mickey the whole time , the thing that worked in her favour is that she got all the spoils of that predicament... Mickey had the raw end of the deal. He was the one left behind. And as Jackie says in Love & Monsters, "Let me tell you something. About those who get left behind. Because it's hard. And that's what it makes you - hard". Only two episodes later we see Mickey again having been left behind by the Doctor and Rose, and he's now a tougher, braver person for it.
The Doctor had been selectively mean spirited to Mickey since the start, Rose joining in with it come Series 2 - perhaps part of how she was becoming more and more like the Doctor himself. It was terribly mean-spirited, but I wouldn't call it emotional abuse. At worst she was jealous that Mickey had a girlfriend in Boom Town, but he called her out on it and put her in her place.
It is for all of this that knocked her down a bit in the end for me though. As interesting as I found it all, there's a whole wide universe out there and she's caught up in these romantic issues so heavily that it means there's little else to her in the end. Other companions seemed to be so much more multi-faceted in the end - be it Donna who dealt with severe self-confidence issues and wanted to better herself and broaden her scope, or Clara who insisted upon maintaining her life at home to keep her grounded. Rose was too often simply caught between the two men in her life, her responses to everything concerning them - occasionally her mother when the Doctor and Rose spared her a thought.