I still find it enjoyable, but its in stark contrast to what you'd expect from Superman today. Offhand, the most superpowered villain he confronts is a robot. Most of the time, it's a bank robber, kidnapper, crooked businessman, etc. The characters ring true, especially for the time frame; Lois is constantly doing dumb **** to endanger herself to get a story, Jimmy is impetuous, but good-hearted, Clark is passive (while not being meek or bumbling) and Superman is ...well, Superman. Overall, the characterization is very much in the vein of Fleischer series, if you've some familiarity of that.
There aren't any epic battles, harrowing saves or grand power displays, but the basic elements are there. I enjoy the nostalgia; the 50's style fanfare and musical accompaniment, the sometimes visible wire work in flight, the 'run and jump' approach prior to takeoff, the simplicity of the villains and their schemes, the fact that Superman lands full-blown haymakers on people without shattering their faces

woot

.
It's Superman of a simpler time, but still recognizable. George Reeves is great in the role. I'd recommend it, but if you're thinking about picking up a DVD set or something, I'd scan YouTube for some clips/episodes first, especially if you're more inclined toward the modernized representations of the Man of Steel.