Clayface, Freeze, etc are fine... read everything. Ra's as well, because they we're established and built within the Batworld using science and so forth.
Apokolips is stupid for Batman. Batman should not involve space travel, especially with 'portal doors'. That was dumb, hell the whole bat-team went there without helmets or anything... it's fine in a JLA book or some random GN or another universe but not in the standard Batworld. It just doesn't seem natural to Batman. If he has portals, time travel, where does it end? Lazarus Pits are alright I guess when it's mainly Ra's... I like knowing Batman has limits and restrictions, it keeps it interesting.
If I wanted to read comics with super-super powers, I would read something from the other 90% that is available from Marvel/DC/et cetera.
I'm not close minded, I just want what is established followed-through naturally. It's cool seeing a gritty noir character get spiced up with a Freeze or Man-Bat because they feel like extensions of Batman's already noir world, just with a splash of sic-fi. But, Darkseid has no ties what so ever to something established in Gotham or what-have-you. He's more than cool for Superman...
Deep down, I honestly have never liked Batman involved with Superman or Wonder Woman. I sort of wish there was a JLA that only involved Batman and Green Arrow's respective families kicking ass left and right. Well, I did basically get that with Batman INC.
Don't take this as me judging other heroes and comics, as I've stated earlier... I've been open to CA and the Marvel world more than ever because of the MCU and not liking Batman books anymore. It's just I prefer gritty noir with a touch of sic-fi separately from hardcore super magic power stuff.
And, honestly that's why I love anything Brubaker/Phillips do. Each of there series are fun, gritty, and have a touch of science spliced in. The whole mystical aspect of Fatale never made me frustrated because it was written expertly within the noir world Ed built. New 52-what ever you call it now, never gets this right because on week Batman is dark and full of drama, the next he's taking portals to Apokolips, then back to solving gruesome murders. It doesn't meld/jive... sort of like how 'Gotham' the tv show seems to random and all over the map, it doesn't know what it wants to be.