I think part of the reason we're talking about Steven Davis isn't so much his performances or the fact that shooting or creating chances is one of his weaknesses (as if this was somehow news), but the fact that he's 'so underrated that he's become overrated'.
Davis is a likable player. People notice his work-rate, he's obviously British and comes across as humble and industrious. He plays a role which we all accept is largely unglamourous and he appeals to the average Sunday League-playing beer-drinking fan, regardless of how 'effective' he actually might be.
The reality is that fans opinions of a game can be very easily shaped and swayed by people around them. Its no unique phenomenon, its standard groupthink.
Case in point: one particularly mouthy guy who sits near me clearly has a personal dislike of Mané, who he spent the entire game hollering abuse and criticism towards (as he does all the damn time). There was one point where we hit a long ball up to Pelle which neither he, nor the defender managed to flick on, yet this guy behind me shouted abuse at Mané for not 'getting near him'. Says it all really; he was literally criticising Mané for not getting on the end of a non-existent flick-on.
Anyway, you take my point.
So yesterday, everyone around us is grumbling and whining bout Mané's lack of work rate and so on and saying that we should take him off at half-time. I come back to look at the forum and everyone says that he's the MOTM. There you have it. (Incidentally, this should largely put paid to the idea that being at the game is hugely vital to having an objective opinion of how a match went, and I've been a STH for getting on for 7-8 years so rest assured I'm no armchair fan).
Anyway, the Steven Davis criticism is partly down to recent poor performances, but also largely down to exaggerated praise that he received at the start of the season.
Is Steven Davis a useful player? Sure.
Is he the kind of player that lets be honest, is never, ever anywhere near the ability of a team that finishes in a Champions League spot and that we would realistically need to improve upon were we to try and reach that level? 'fraid so.
Long story short? He was never that good then, and he isn't that bad now.