Fangraph's wOBA takes into accounts SB and CS. It does not take into account base advancement on hits but you'll have to believe me when I say that it is relatively minor, compared to everything else. For a time, Pierre was identifiably the best base runner in the league and it resulted in only a few net runs. Gomez will also hit into less double plays on infield groundballs. I don't know this to be true for a fact but I suspect it is also a minor component of his value. That is probably because if you are hitting a lot of infield groundballs, you are probably not a very valuable hitter to begin with (there are exceptions of course). There are a lot of nuances to the value of baseball players. I know there exists much more sophisticated projection systems that takes into account hit types (groundball/flyball tendencies), speed and other things. I suspect that they are incrementally better but we are talking about a small difference. The basic batting events, when weighted correctly, capture the vast majority of the value of a batter's offensive performance. For a messageboard comparison of bench players, wOBA does just fine, IMO.