I loved Earth 2. Nicola Scott's art has gotten really, really amazing! Also, I loved seeing Wonder Woman's bloody death - too cool. Also, my favorite Flash showed up looking all sexy at the end (kinda), so I am hooked.
I was lukewarm on World's Finest. George Perez's art doesn't do much for me anymore, but the writing was pretty good. I'll give it a few more issues before deciding whether to keep with it.