My view is that Earth 2 and Worlds' Finest aren't terrible books, just that Earth 2 isn't the JSA as it should be, and WF isn't Power Girl or Huntress as they should be.
Doesn't mean that WF isn't the most fun book DC's got going right now, just that it isn't what it could or should be. And Earth 2 could and should be something more. Instead they choose to junk the WWII thing, kill of the Trinity in the first issue, make the JSA old guard newbie 20 somethings, make Alan gay, and God knows what else, all in an effort to court whatever Didio thinks is edgy. Heh, Dan, These guys work best as older heroes! And Obie was already gay, now you wrote him out to make another character gay...
Sure, Batman dies...eventually in the old stories. But he's around for quite some time, and Superman and Diana are around till the end. And Diana doesn't get killed by a nobody like Steppenwolf, and worse, Clark doesn't get it from a group of Parademons. How "super" is that? And the lame explanation of why the GL power didn't act earlier is just that. Plus, Robinson seems to forget that there were two "sun gods" around back then, not just Superman, not that either seemed to do much good.
All that said, if you didn't love the old JSA, you can probably like this. If you did, you'll have a harder time with it.
As for WF, it's certainly a charming book, with appealing leads. But in the wake of Power Girl's own series being canceled for the reboot, it seems a bit...hollow. Huntress fares a bit better only because the version of Huntress hasn't been seen in ages. But at least this is a buddy book where the attraction is how the two leads play off each other.