"Denver good or bad" is an unfair and incomplete question. There are great spots to ride and routes to commute on, with relatively no climbing and good weather most of the year, and there are lousy ones. If where you're going is one of the lousy ones, then it's bad.

I learned on Bike To Work Day last June that it's easy peasy for the first 14 miles from my house, save for one short stretch on a narrow road early in the ride. The last mile, mostly near Park Meadows Mall and the Tech Center, was a white-knuckle trip: on and crossing heavily trafficked thoroughfares and through some construction (so that's not permanent, obviously). The trip home was a bit nervous, with more cars jockeying for position. I intentionally delayed that ride for 45 minutes to let most of it clear out.

That was just one day, but I don't expect to try that any time soon. At least it wasn't too hot, so I was able to sponge off and change in the men's room, and didn't have to sit in wet clothes all day.