I said it adds value to the team, but I ignore that when evaluating individual players.
There's obvious value in driving in the game winning run with a single, but that was only possible because of factors outside of that players control, i.e., his teammate getting on base to score off his hit. The same player could have had a single with nobody on base and it's not nearly as valueable to the team, but was his performace any different?
IMO, a player controls how often he gets a hit, via talent, but he does not control when those hits happen, they're just random variation. A player whose true talent level is a .300 BA will result in a .300 BA over a sample size of a few thousand PA's, but if you randomly select any 100 or so of those PA, his BA could range from .220-.400, but his true talent level will still be that .300 hitter. It wasn't because he was clutch, or unclutch, it's just because in the small sample size his BA will vary greatly from the mean. So I don't give bonus points for getting a clutch hit when evaluating a player.
When I analyze players, I try to minimize stuff that is outside of their control, and that includes the situation. I'll look at the end result, what were his triple slash stats, his ISO, his K and BB rates, how is he on the basepaths, how is his defense, his arm, his range, and then I'll form my opinions based on those. I'm not gonna look at the when, only the end results.