My first espresso machine was such a Sunbeam. It had a few inherent faults.... such as a grouphead that dislocated itself mid-pour and a pump that occasionally was noisy...but it didnt make too bad a shot....with a bit of patience.
I know that the size of the grind made a big difference to the resulting shots, as did the quality and purity of the water used. I used to fill the water reservoir with filtered water from a jug filter. The machine needed a de-scale occasionally too.
But persevere... the quality and consistency of brews that I poured from this little machine was nearly always better than any of the fast food places and most of the cafes that I frequented.
I only realised what coffee really SHOULD taste like when I started to roast my own beans and when I moved on to a better machine.
And be careful what you wish for. My search for Coffee Nirvana has been frought with serious side effects...now I really have trouble scoring what I consider to be a fine cup of coffee produced by ANY cafe!