From the screencaps I've seen at cinemasquid and elsewhere, I really don't have a problem with how Aliens looks. The only thing that bothers me about that release is how Cameron couldn't restrain himself from digitally erasing stuff. He couldn't even keep that kinda thing confined to the longer version. So, not only should the '91 version be called the 2010 version of the 1991 version, but the '86 version is the 2010 version of the 1986 version as well. Ugh....
I don't know The Terminator well enough to guess what kind of visible flaws Cameron will inevitably fix for the new transfer. I know T2 significantly better, but then again I can't think of anything that needs fixing in that particular film aside from maybe Arnold's stunt double's face being somewhat obvious in that slow-motion bike shot.*
Speaking of which, I heard Cameron digitally replaced Kate Winslet's stunt double's face in that slow-motion shot in Titanic for the re-release. Any truth to this???
*It's funny because they had the technology by 1991 to digitally remove the wires holding the bike, but not to digitally replace the stunt double's face.