I am not a Sears fan, but I think the issue here is that it's a cheap tractor more than it's a "Sears" tractor. You get what you pay for regardless of brand. Even Deere makes cheap junky riding mowers (the ones you can buy at Lowes and HD for example).
This was apparent to me when I was shopping around about 12-13 years ago. The Craftsman models were all junk, as were most other brands. Back then, the cheap Deeres were branded "Sabre" and also junk. The only good ones I found in this area were the higher priced Cub Cadets, and the higher priced Deeres. I ended up with a Deere LT model, which is about equivalent to an X500 in their current lineup. It's been quite good, only needing routine maintenance and new mower spindles after I hit a stump. It was definitely more expensive than equivalent Craftsman models, but noticeably better built all around, and with better features too.