I'm asking because I do not know, not because I think he was or was not deserving (that's what I'm hoping to find out) but how did Pickett rise to Division commander? Was it out of necessity/need or ability?
I also don't really know his true role was in "Pickett's" charge. I guess he set the brigade alignments but once in motion, did he do anything?
I think the answer to your question is 'necessity, it was also due in part to his alleged abilities, allow me to explain myself.
In 1846, Pickett attended West Point military academy and he didn't really do that well, he came last in his class but there was one quality that he did have and that was courage. He may well have graduated last in his class but he graduated none the less and he attained the rank of second lieutenant. He was called upon to serve during the Mexican-American war and that is where he made his mark, he was involved in the assault on Chapultepec castle and this I believe was the moment that raised his profile. During the storming of the castle the flag bearer was wounded, on seeing this, Pickett took the flag and with a handful of men proceeded to fight his way towards the flagstaff, he pulled down the Mexican flag and raised the American flag, as you can imagine this action got him noticed by his superiors, it was also significant in that the fallen flag bearer whom Picket took the flag from was none other than James Longstreet. After his actions in Mexico, Pickett's was later described by Winfield Scott as being 'distinguished', even William Worth described Pickett as 'distinguished for gallantry and zeal' and Bvt. Maj Willian R. Montgomery described Pickett as 'noble and Gallant', in fact it wasn't long before Pickett earned another honorary brevet for gallantry for his actions at Chapultepec.
In my humble opinion, The Mexican war laid the foundations for Picketts future military career, we know that he was a below average West Point student and many would agree that Pickett had a certain arrogance about him but that's how some people are when they have a lot of self belief, I don't think that Pickett lacked the necessary skills to lead men but the more I read about him the more I'm left feeling that something changed within him (an assumption on my part but I actually think that he suffered from depression)
Whilst he served in Texas, he was responsible for training men and developing infantry tactics, he certainly would have understood how to lead from the front and get the best from his men and there were certainly rare occasions when he showed good tactical understanding but just as he did at West Point, he never really applied himself.
It's also of some significance that Picketts father was quite influential and wasted little time in calling in a few favours. It really was the case the George's father (Robert) 'a retired Colonel' wrote letters and campaigned endlessly to secure a promotion for his son, Robert even contacted Longstreet and asked him to write supporting letters, of course George eventually got his promotion(s)and steadily worked his way to the top.
I think you have to ask yourself, did George Pickett obtain his promotions through his own military skills and ability or was he given a helping hand. If you consider some of the glaring mistakes that he made during the CW, (Shad bake) for example, I'd say that he benefited from his actions in Mexico but he also massively benefited from having the surname 'Pickett' it's not what you know, it's who you know' best describes Pickett's military career.
As for Gettysburg, he had very little to do with the planning or failure of that infamous charge.