To me, at least, jersey barriers seem like a temporary thing, something that belongs in a construction zone, but not the finished product. If I'm being nit picky, I want the separation to be low enough that a pedestrian can step over it, too.

Best case scenario is obviously grade separation and distance between cars and bikes, but in a confined space, I dont think these barriers are horrible. Maybe the best move would be full-height barriers at the ends, and these low ones in the middle?

I ride on this street fairly often. So let me tell you from direct experience: for Atlanta, this bike infrastructure is actually pretty damn good.

Ironically, the next bike crossing over I-20 further East, at Bill Kennedy Way, has Jersey barriers and urbanists are complaining about them because they're done wrong. GDOT refuses to anchor them into the street properly (claiming bullshit about "maintenance problems" or something), so when cars hit them they get pushed into the multi-use path.