You guys are all such Debbie downers! If it were four Toho kaiju films you'd probably all be ecstatic! (For reference see the enthusiasm in the legendary monsterverse and shin Godzilla/new anime threads).
I for one am excited by the prospect of a bigger cinematic bat-verse. All we've really ever gotten in the past is Batman films. But getting batgirl, nightwing, et al has great potential imo. Especially after watching how great all the Arrow/Flash crossover stuff was on tv (caveat, I'm still finishing up Flash season one and arrow season 3 on Netflix so my opinion is colored only by episodes up to that point).
Batman is by FAR my favorite comic book hero and I'm just as excited by this news as I am all the new "golden age of kaiju" news we've gotten the last year or so.
I know a lot of people didn't care for BvsS or even Bat-fleck. Personally I really liked Affleck as Batman (yeah he kills people, but so has EVERY live action film Batman since 1989. I don't love that aspect, but I've made peace with it). And while I was disappointed in the theatrical cut of BvsS, the ultimate edition totally fixed it for me and now I quite like the film.
So despite WB's arguably shaky track record I'm still hopeful about justice league, can't wait for Wonder Woman, and choose to remain optimistic about the onslaught of bat films.
Relating it back to Toho again, they have an insanely shaky record of making good kaiju movies if you look at their entire history, but I STILL get excited and look forward to every time they announce a new one!