Do you think I got screwed, or is it just part of the hobby?

I have a couple suggestions...
on the lower end noise... Did you check the torque convertor bolts and pulley bolts? Are there any marks on the timing cover from the balancer hitting it? What fuel pump is on it? Did you try removing the accessory belts one at a time to see if the noise went away? When did it start making the lower end noise again?
on the oil use... It could be ring seal due to cylinder finish... the leakdown test would pin point that. What do the spark plugs look like? It could also be the PCV valve.. How is that system installed? What valve covers were used? It could be the intake leaking internally... Is there any sign of oil pooling in the intake manifold near the bolt holes? Did you run a wrench around the intake bolts to see if they are all tight?

The assumption that mopar engines are anything special is as poor as assuming any issue is a sign of someone out to screw you. It's normal to get angry and upset. It's also counterproductive. I would make damn sure you know it's their work before you accuse them of anything. If they are an hour away, offer to pay a guy $20 afgter work to come to you and listen a little. They might do it for free if the concern is great enough. What you are describing tho could be many things that are not their problem. If it proves to be their problem, it's assinine to believe they owe you anything more than what they gave you and maybe the supplies to re-fire it. Shortblock, long block, oil and filter, etc. It's like telling the cook he owes you 4 dinners because the one he gave you sucked.