I actually didn't mind M Squad-- I had never seen the show before, and I was happy to have the all-in-one, and relished it (enjoyed it through and through).
Have Gun was like that for only the first half of its run, though, IIRC-- when they started getting into volumes for the second half of the run, the quality improved immensely (but then, at least one volume release on the second half of the run lacked subtitles as well).
True-- I think it's because of those of today who boost the sales of modern shows on DVD/Blu far beyond those of the shows that many of us enjoyed from the past that the modern shows have more releases than older shows.