I like what I saw from the snowdrop engine. No visible pop in, the level of detail on characters and objects scales great with distance. NPC's appear to persist, gradually drawn into field of view without visible glitches as the level of detail increases as one gets closer.
The game grabbed my attention, I've shelved ROTR for now, partially because the beta expires soon but also because I'm having fun. I don't know if there is enough content at launch, I am leaning towards waiting a while after launch to join.
Potential is certainly there, Ubi may have a online shooter franchise on it's hands, destined to join COD and BF.
The building blocks are there to do magic with seamless multi/singleplayer transitions, it's up to Ubi to craft epic missions, which they definitely have the tools for, it's up to Ubi to make or break the game.
It's a beta and all that but always online policy is annoying, I should be able to play singleplayer while the server is down.