Gobert was pretty poor tonight at giving up the basket after a block, but usually he's pretty good at getting the rebound or blocking it to another player. This is what makes Gobert as valuable as he is:
http://stats.nba.com/tracking/#!/player/defense/?sort=DEF_RIM_FG_PCT&dir=-1&CF=MIN*G*15|BLK*G*1
Also if you go to Nylon Calculus he saves the most points per game in the NBA (which does include, usually getting the rebound after a block).
Players shoot 39.2% at the rim when Gobert plays which is almost 3% better (which is HUGE) than the next closest starter. He's the only defender that allows under 40%, which is better than Hibbert and Ibaka's best years as a rim protector. Last year he was number 1 as well. Compare that to someone like Whiteside who has a huge lead in BPG but gives up 48% at the rim (which as you can see in the link is lower than players like both Lopez's, Giannis and rookie Porzingis). Gobert is very selective about the shots he tries to block and doesn't go after everything. He fouls at an extremely low rate for a shot blocker and a lot of times will just go straight up as opposed to chasing blocks like Hassan. He's also number 1 in defensive plus minus and top 10 in defensive rating. He has missed 20 games this season but the Jazz are 20-14 when he plays.
Gobert struggles against Portland, I don't know why but he is one of the 10 best rebounders in the NBA by rebound rate but never seems to rebound well against Portland.