i don't think he still has the disintegrator...... that was an older Ultron model that Doom had upgraded during secret wars
although i have reconsidered........ Wonderman managed (while extremely pissed off) to throw and smash Ultron around enough to damage his internal components and shut him down, so unless he's made more upgrades (which he almost certainly has) then Superman could do the same
i never suggested that........... your "millisecond" theory is about Superman's reaction time, GL's may be faster once he initialises the scan but his human reaction time is way below Superman's..... the Ultron's don't have to react that quickly as they are the ones acting. Once their attack is planned they can execute it with perfect timing and could possibly take GL out before he knows what's going on.......... obviously superman won't be easy to take down but enough hits from disintegrators and other powerful weapons will take down MM and Aquaman to severe any psychic links
Superman can be held off with the good old hostage scenario if necessary........ there were hundreds of Ultron's built, they can beat the JLA
First of there were hundreds of titanium and secondary Ultron's built. GL would not be taken down since his ring's forcefield's protect him. The JLA won't just stand still. They're going to be defensive and offensive despite their opponent's supposed lack of threat. GL will be protecting his teammates from any disinergrator rays or powerful weapons they may be emmiting. How can the Ultron's "plan" to take out GL when this battle is spontaneous? MM can turn invisible and intangible. Not to mention he has near-Superman invulnerablity. It would take a lot of effort from the Ultron's take him out. GL would just cage them with his ring, then the JLA would procede to beat the rust out of them. The Ultrons would lose.