Some of the most decorated and celebrated players of all-time underachieved relative to their talent, it's not a contradiction. Although usually it's their lifestyle (Best, Maradona, L. Ronaldo etc.) or injuries (L. Ronaldo, van Basten etc.) but still. Giggs was world-class for a good few seasons and he was a crucial part of multiple different title-winning teams at United over two decades... yet he was never the man. Cantona, Keane, Beckham, Cristiano, Rooney... there always was someone better and/or more important there, usually a few people. And when he was just coming through, that untouchable electric left-footed reincarnation of George Best, it felt like sky was the limit for him and he'd be the best and the most important player at United & Great Britain... at least.Do you really think Giggs underachieved because of predictions people had of him when he was a teen? How is that? He achieved everything possible. If someone said he would achieve all this when he was a teen we would not have believed it.
The closest he came to that status were those late 1990's big European games when he was often our most potent attacking threat but still. I don't think that it's the perfect way to access individual level of footballers but Ballon d'Or long-lists are quite damning in that regard. He barely ever broke through top-20 (joint 9th in 1993 and 14th in 2009) — while other wingers and attacking midfielders regularly got high placements (Beckham) or even wins (Figo, Nedved).