If you haven't already, buy the bike.

Why?

Because now you should have a firm grip on the caveats. You took a great first step in seeking out advice from a variety of riders. Armed with this information, let's consider the unfortunate possibility that your new purchase turns out to be a complete dud.

It shifts poorly.
It's brakes suck.
The chain slips.
The handlebars break.

Even in that worst of worst case scenarios, you're equipped with the understanding that you knew what you were buying when you bought it. If all or any of this happens, you won't be inclined to shun biking as a newbie who thought all bikes were the same. You'll know, "Hey, I bought a Walmart bike because it's what I could afford, and they have a reputation for being low quality." You'll simply shun Walmart bikes...and start looking for a higher quality one.

Of course, realistically, it probably won't be the nicest biking experience, but it also won't likely be horrid either. For a 1 mile commute, it should be more than sufficient. Just start putting some money back for an upgrade and get out there and ride.