Despite Tina's hundreds of connections to the show, she really is a product of '80s' OLTL with Paul Rauch, and the flashy decadence that was the soap world of that era; because she spent so many years off screen, she didn't get to evolve with the times. I think the problem for writers comes with trying to balance what everyone expects from Tina (that campy, fun, madcap decadence) with where the more subtle tone of the show today. They can't have her be too '1986' because there isn't anyone in that sandbox to play with her, but still have to find a way to have her keep her essence.
My verdict is that they should have brought her back full time *years* ago.