Most of the raid won't have numbers they can really show off though. If you aren't the top DPS on a fight...no one cares about you unless your DPS is really low...in which case you are likely to be kicked. Tanks don't have to rely on a high number for the raid to know they did their job right.
If you are looking for glory and having your ego stroked...being a tank is absolutely the best thing for you to do. A successful tank gets far more credit that the Top DPS. There isn't much to brag about being #8 on the DPS chart.