There's many healthy debates here.

stopping at reds vs. 20 mph
cruising vs. 400 watts
pricy new vs. dumpster diving
new vs. fix the dang bike--will it last?
low cost wallyworld bike vs. real world performance
internal gear hub vs. derailer
English 3 speeds vs. roadies
linear brakes vs. discs
lightweight aluminum vs. buttery steel
dynamo lights vs. battery high power lights
rack/panniers/trunk bag vs. backpack
street clothes vs. lycra
rain cape vs. wet suit

The one debate that was resolved is: commuting on a bike is a blast.