/diy/ - Do It Yourself

Stupid question;
If a circuit has no passives (resistors, capacitors, inductors, etc), does that mean it's a bad/incorrect circuit?
I ask because the circuit I designed uses an AD595A (pic related), a thermocouple, an SSR, and a Teensy μC with appropriate wires hooked up to each component. It works for what I need it to do (oven controller), but it slightly bothers me by how simple and straightforward the circuit is.