I can relate. When I first started cycling back in May I started with a walmart bike. I bought each one in a box because I knew from online that they would not be lubed properly. The first bike lasted 354 miles. The rear hub fell apart. Walmart has a 90 day return policy so I swapped it for another bike. That one last 525 miles and the bottom bracket cracked. Again returned it because it was within 90 days. After that I was done with walmart bikes.
I did not take either bike to a bike shop to tune before riding. I used you tube to learn how to adjust the shifting and brakes. Each bike had its own set of glitches. One of them seemed like I had to make adjustments after every ride.
The takeaway, It got me into the sport, and having the ability to return the bikes after I abused them was a plus. Beyond that I would stay away. I feel like department store bikes are made to ride the first week you buy them, and then sit in the garage. Hope this helps.