moving the goalposts here, Brwned.
Keane and Viera are different players to the likes of Scholes and Giggs. They are combative players who have more often than not been charged with the main defensive responsibility in midfield, same as Lucas is. And yet you choose to use Butt, Fletcher and Flamini as the benchmark for the role. Conversely, we might as well bring up players like Danny Murphy as important playmaking midfielders who were important but not top notch. Why set the benchmark there?
Going on your post, they are indeed ridiculously underrated. I look at players like Souness, Redondo, Rijkaard, Desailly, Matthaus, Hierro and I see magnificient players. It's a great disservice to that position to say that what they did what so much easier than what players like Scholes and Giggs do.