If you were a big tennis fanatic in the the 70s to early 80s, the Dallas WCT finals was an impressive tournament for the time. Personally, I would rank it higher than the Australian Open, just a notch below the French Open and Masters Finals in MSG, and lower than Wimbledon and USOpen.
You had the top players gunning it out in a round robin format.
To me, McEnroe winning it multiple times was close to as impressive as winning a slam event. Like Moose Malloy said, the timing of this tourney was terrible, but it was supposed to be somewhat of a maverick tour competing against the regular tour.
I remember seeing McEnroe, just dominate everyone in Dallas in '84. It was like he was toying with them. I still can't believe he lost the French Open that year.
If anyone ever saw McEnroe play live in '84, you would consider him the G.O.A.T. I have seen Federer, Sampras, Agassi play live, and I am still most impressed by McEnroe. Never saw Laver play in person.