I've never owned one, but i've wrenched more thn my share. Once you lube everything, and go over the wheels, they're serviceable. the wheels, out the box, are completely muffed up. Spokes have serious issues; unevenly tensioned, and few are tensioned much at all. Even after the wheels are sorted, the rims are usually low quality and prone to folding, plus the spokes are usually plated and rust in a hurry.
So, yeah, some lube and some time on the truing stand will make the bike serviceable, but then what? Then you have some garbage tires which will flat regularly. You have brakes that work, but barely. It may shift, but those plasticky rear derailers with the giant pizza-cutter sized pulleys don't index well. :shock: You have a heavy new bike that you spent $100 for, plus too much time, plus if you're actually going to ride it you'll need new tires ASAP. I don't know about you, but my time/labor is worth something. I don't want to spend time/money/effort on a bike that has nothing going for it besides an cheap initial price, something with no value.
For the same money, you could get something older and better with character. Something that already has lasted, and will likely outlast the current WallyWorld bikes. Something that seems more worthy of your time/money, b/c it kind of deserves it, having lasted for decades. At some point, someone bought it at a real shop, and was actually proud of it.
Fwiw, I'm not just talking about the beloved old American cruisers. I'm mostly talking about 80s/90s mtn bikes, early hybrids, steel road bikes from makers that don't have a "cult following" that's driven the price up.... Many of these will cost you less in the long run, plus you'll have a somewhat unique bike, rather than the $85 Wally special that every single other broke guy is pushin, too.
Oh, and for the record, I know a guy who bought a Wally mtb and taco'd the front wheel on the 5 block ride home from the WallyWord, first day