Spinal_cord is correct, youtube 3D option is an excellent way to show the 3D effect. There's not really any "better or worse" 3D effect. The 3DS can output the same kind of 3D any other system or device can do, the way it goes about it is just different. Spinal knows what he's talking about here, i assure you.
As for the jaggies, i can tell you that it probably did lose a lot of quality when upscaled. The game itself i can't see much difference between it and the other games (maybe a little when compared with Wii, but not PSP). We do know that the 3DS does support some level of anti aliasing however, at least when in 2D mode. Resident Evil 3DS games have been confirmed to use it when in 2D mode. So there's no excuse for SEGA not to reduce the jaggies when played in 2D, besides just sheer laziness (which isn't a valid excuse of course).