For sure. Ariza is an unsung hero, our defensive anchor. Terry never fails to amaze me. Sometimes I think it's hard for him at his age, then he bounces back. Garcia also contributes to the team culture, despite his limitations. If he and Terry were in their prime, we would be a near elite team.
Defensive win shares. http://www.basketball-reference.com/leagues/NBA_2015_advanced.html Click on the DWS column in the above link. Currently the top 3 Rockets in that category are 1st Harden, 5th Ariza, and 33rd Donuts.