>>10243800I think it depends on the figure. A lot of kids' toys age well because they were designed to be fun rather than definitive collector pieces of characters, so they stand on their own merits. I've been collecting some Cybertron TFs lately and they kick arse.
Pre-Figma "collector" figures tend to age like milk though, at least non-mecha ones. Because they're designed to be the character first and fun toys second, they're often either poorly articulated, weirdly designed or both. Post-2008 has been a lot better and a lot of companies managed to get a better balance between being fun to pose and looking "right". The problem with those is that some companies such as Bandai improved at such a rate that their older releases, whilst still fun figures and hardly bad, are absolutely BTFO by their newer stuff (see the older Kamen Rider Figuarts vs the new versions).
Also OP's pic of Sideswipe is horrifically mistransformed. Done properly he actually looks pretty cool.