I won't deny being crazy, but here are some things to consider:
Average NBA scoring last season: 114.7
In preseason, we gave up 101, 85, 100, 86 (average of 93.0). Before you say "ULM doesn't count", know that they scored the 2nd highest against us, and without that game our average improves to under 91.
As the grumpy MM pointed out, we now have FOUR plus defenders. No chance we don't finish top 15 in defense, probably top 10, and MAYBE even better.
Last season we were 18th in ortg, and 27th in drtg. If we remain the same on offense, then we have 15th in defense and 18th in offense. Sounds "competitive" to me.