I don't think calling people "mean spirited" and "childish" encourages the "civil discussion" you claim to want. As a matter of fact I don't think any of these arbitrary divisions (PT fan, OT purist) are in any way conducive to actually discussing the merits of the movies.
My problem with the PT is that it doesn't do enough to link up with the OT in a meaningful way. The most obvious problem is the over use of CGI. The OT universe is not a pristine looking place. It has a used, gritty feel to it that was lost in the PT. I think it should have been filmed on location with real sets just like the original.
Additionally, there are too many things that are explained in the PT that don't need to be explained (Midi chlorians, force ghosts). Conversely, there are so many missed opportunities to explain plot holes in the OT (why was Luke able to train for three weeks and go toe to toe with Vader who had been a Jedi for 30 some years? Why was Luke "hidden" on his home planet under his real last name?)
I don't hate the PT and never have. It's frustrating because there were alot of missed opportunities (Darth Maul, Liam Niasson playing Obi-wan and McGregor playing Anakin etc. etc.) but I'm just glad to have Star Wars back. And for all the missed opportunties in the PT there are alot of great things like the Darth Maul battle, Mace Windu, the Seige of the Jedi Temple and so on.
I think of the PT as existing in an alternate universe. Things are similar to the OT but they don't quite match up. I think the same thing about the CW series. As individual sagas, the OT the PT and CW are all great. However, trying to make them one whole story just doesn't work for me.