In my eyes, Anakin Skywalker stopped being a "role model" the moment he slaughtered an entire tribe of Sand People, down to the last man, woman and child. Everything else was just a holding pattern until he got the suit.
Of course, I have issues with him being perceived as a role model in the first place, seeing as how he was a whiny, selfish whelp.
I suppose one could argue that my impressions are colored by preconceived notions about the character. Before the prequels came out, I imagined Anakin's personality to be like Thor in the recent film adaptation. I imagined a brave, strong warrior that relished action and excitement, yet still cared about those around him. He would exude confidence and charisma, easily forming lasting bonds with his friends and colleagues. He would be prone to theatrical displays, yet still manage to deliver genuine words of wisdom and stir the hearts of those who heard them.
There would be one major weakness however; he would have a burning need to see justice prevail. To that end, he would begin to dabble with powers of the Dark side, tempted by its promise of power. Thinking he could control it, he would delve deeper and deeper until it would ultimately consume him. By the time anyone realized the full extent of his fall, it would be too late. Instead we got this:
Palpatine: Join the Dark Side and slaughter a bunch of children and I may or may not be able to save your wife.
Anakin: OH HELLS YEAH!