For the Guardian: While this is true (and I do love the mini for him!) the feeling that damage isn't so much mitigated as given a higher chance for avoidance makes me worried about whether the eight stones are really worth it for the model. I'd really have to play with it some more to finish off my opinion, but he IS really nice as a tar pit that's almost impossible to disengage from without blowing a lot of useful resources. Then again, his ability to force friendlies out of melee with that trigger on his shield is pretty sweet looking so... time to give him more playtime and find out, I guess.
As for the Lone Marshal, I largely agree. It felt like they wanted to make the Riders are more distinct existence but they couldn't just keep Trick Shooting on the Pale Rider so they threw it as a castoff ability onto another model, put a few useful but not incredible defensive abilities onto him, and then called it a day. The combination of high mobility -and- shooting capacity is nice, but his shooting ability isn't particularly exceptional in a faction that can field terrors like multiple Austringers. I do want to put him on the table once or twice just because his model is sweet, though. Maybe he's more useful as a flanker on earlier turns and an objective grabber on later turns than I thought?
Edit: And I'm more than happy to be wrong! I primarily play Guild, so if I'm missing anything about just how good these models are then I'd love to know to improve my own play.