I'm not sure 'awarded best on ground' is any better a metric then the player ratings.
The player ratings show up things you might not see, as a fan, otherwise.
They take into account everything a player does. They don't just see 6 flashy things that make you ignore the rest. A player is awarded best on ground by mug punters. We all know how blind the 'experts' are.
Having said that, the player ratings, like any stat, don't show the whole story, miss some of the intangibles, and rate ball use/creativity as the single most important stat. Some would argue that it isn't.
It is interesting to see which highly thought of players tend to be consistently ineffective. And which lowly players are doing things you don't see.