I would call 2.1 blocks/game very high, but I wouldn't call it exceptionally high. In the NBA (I know, BB isn't the NBA, but for modeling/comparison purposes), the league leader last year (Serge Ibaka) had 3.03 blocks per game. This year's season leader so far is Anthony Davis at 3.18 blocks per game. The all-time leader for a season ever in the NBA was 5.56 (Mark Eaton 84-85) and the lowest season leader ever was 2.58 (Bogut 10-11).
So, great shot blockers don't average a TON of blocked shots. 3.0/game is high. My league leaders (DIII USA) were 3.3 and 3.2 blocks/game last season.
So in terms of blocks/game, the stats in BB seem somewhat true to reality. But, we can't see the live game action, so we don't know if shotblockers are altering or preventing a lot of shots. That's the frustrating and uncertain part. If we had a stat for 'opponent FG%' and 'opposing team FG%', that'd help a lot. I know M2M vs zone defeneses would skew that statistic, but it'd be more helpful than nothing. Or the NBA has a "Defensive Rating" stat which measures the points allowed per 100 possessions while a player is on the court. Defensive Rating is better than the +/- stat for individual games because it isolates defense instead of combining it with offense.