If it were available it could balance out the value of D to forwards, and put some credit where credit is due. +/- is great and a good gauge of solid two-way play, but we all know it'll get boosted on better teams. Blocked shots is one category that can help equalize how stats are counted/weighted and create something more interesting to the leagues.
Also, it's a harder stat to find, but it would be great if hits were available. The only grittiness and dirty work rewarded in the leagues is PIM, which is not a consistent guide for contribution to a team.