The architecture is easy to move around in- but I don't think that +50 health is worth a rocket-jump for (at least I couldn't find another way to get up to it).
My only major gripe about this level is that I couldn't go up into those guard towers- or RJ up to the roof (kept hitting my head against the sky and couldn't go all the way up).
Would have been nice to see more skeletons (or impaled corpses) in the cells down below. Maybe some custon sounds like the distant screams from Half-Life could have given it a bit more atmosphere too.