Because my 84 wagon is in the paint shop and my 85 wagon has a front end shimmy I haven't gotten around to fixing, our 240 has been our main family interstate travel machine since the start of the year.
I have never had issues on the interstate with it, but its also currently getting good reviews from my wife and my 17 year old son.
Sure its not the fastest off the line, but it merges with traffic and does fine at highway speeds. It does get loud above 70, but I have no issue running with traffic. My son recently admitted getting it to 90 and he said the motor was completely wound out, but its designed to do that.
I guess I am not seeing the issue. It doesn't go to Atlanta or Nashville much, but when it does its fine.
I actually drove through LA traffic in my 85 a couple years ago towing a trailer. That was probably equivalent to a 240 in the same traffic. Maybe it was my TN plates, but people laughed more than road raged at me.

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1985 300 TD 448K
1984 300 TD 278K

1983 240D euro 240k
1994 f-250 idi turbo 330K
1986 f-350 IDI
1987 F-350 IDI

1985 JD 1050 4wd
1965 IH 3660