A reasonable person maybe.
1. That was episode VI (6), not episode (IV) and her memory of her mother was described as "Images really. Feelings." Which (with little imagination and some empathy) could be attributed to a little girl's idealization of a mother she never knew blurred over time.
2. When in the series did anyone ever explain that Vader wore a suit because he was 'battle-scarred'? When did you see any jedi save possibly yoda actually levitate or indeed ever use the force to move against inertia? I don't think I need to mention how stupid the lava comment was.
3. The one thing we're told again and again about the force is that you can't just jump sides whenever you please. Once you turn to the dark side, you can't just go back (especially when, to get there, you murdered a bunch of children). He gave hints that he was dissatisfied with how the Senate was running things and intimated that he could do better. The second and third movies were all about his dissatisfaction with the Jedi order and his yearning to use his considerable power to force people to conform to his world view, held back only by his jedi training, but fostered by the soon to be emperor.
Aside from all that, it was Obi Wan (who wasn't actually there when he turned) who told Luke he was seduced by the Dark Side which just makes that line hearsay.
I'm sure you have more and I'm sure they're just as well thought out and shallow as these. There is criticism that can be leveraged against the Star Wars saga as written by Lucas but frankly, you can do that to any movie or set of movies in hindsight.
