Glad to say I have owned the following Martins:
D-35 (10+years, wish I still had it. So balanced and powerful.
D-28 (kind of a dud)
HD-28 (first real nice guitar but a bear of an intonation problem)
000-18 (total dud, seriously, plywood would have sounded better).
Well, I never said that they were all great!
I owned a '76 D28 that had one of the notorious misplaced bridges, and I was never able to get the intonation correct despite a few different luthiers trying. I finally sold it and swore I'd never buy another.
It's a good thing that I don't follow my own advice though, because not long after I joined this board in 2010, I bought my D18 David Crosby, and it was and is one of the top five or so guitars I've ever played. In fact, two of the other spots in that group are also Martins; my '69 D28, and 2013 D18 Authentic 1939. Martin wasn't doing great things in the '70s, and neither was Gibson, who were even worse. and despite transforming to the "tank era", Guilds were still the best of the lot in that decade. When I bought my '73 D50 "new" in 1976, it won the shootout with a J50 and D28. The D28 was marginally better really, but I couldn't realistically afford it.
Despite their recent binding issues, Martin is making some truly great guitars these days, at least in their "traditional" and higher end models.