Although Anakin looked like a bigger pussy in episode II, he stills looks like a baby and Han would have smacked him and have fallen in love with Leia's mother and abduct her to some random planet and she would have been lost forever.
And to think of it, even the sketch to how Vader looked before being getting maimed was cooler than the Anakin we know now. And to f*cking think of it again, what the hell was Lucas thinking to throw Hayden in ROTJ too?? What next? Vader removing his mask and revealing to have a young Hayden baby face?
Say if Han met Anakin in real time in Ep III, Han probably would not have looked up to Anakin. Han would have been 10+, and Anakin, 23, so there could have been some Jedi hero-worship. But I imagine Han was a bit of a smart-aleck kid.
But then again Han said the "Hokey religions & ancient weapons" line. Han probably forged that opinion after the Jedi Slaughter.