I agree with you. I have had many sewing machines in the past: Neechi, Singer, Bernina, Janome, Juki and Viking. None of them sewed the same. All were good sewing machines for their time, and they all had their quirks, but none of them sewed alike.
You have to be really careful when buying some of the new, less expensive sewing machines they have on the market these days. They may sew well at first, but after a while, they will sew terribly. At the senior center, where I sew, a lot of the elderly ladies are getting these lighter weighing sewing machines and they work fine for a while, then the stiches don't sew right or they skip stitches, they won't sew over thick seems and worse. They end up buying another sewing machine and pay even more money. As they say, "Buyer beware!"