What do you plan to do with it?
The more that you expect the bike to do for you the more strongly I'd recommend going to a real bike store. Having said that, there are no bad bikes, there is only "use other than intended."
Check out the kitchen entrance to any restaurant. You're likely to see department store bikes that get used daily with minimum maintenance, are less theft prone and, if they do get stolen, are less of a loss. In other words, that bike that many of us might scoff at, perfectly matches it's intended use. What's wrong with that?
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.