Strictly speaking while Vince did violate some "unwritten rules" of business etiquette while trying to expand nationally in the 80s he was not alone. Remember, Vince started forcing arenas to sign "Exclusivity" agreements (they wouldnt host any other wrestling shows except WWE) in the 80s as Jim Crockett started moving into his territory. Crockett expanded into Philadelphia and was doing very well, even after Vince got him banned from the largest arena, he was still selling out and drawing good ratings there. Same in Pittsburgh, although it took much longer for Vince to get an exclusivity agreement with the largest arena there. Once Crokcett moved into Nassau Coliseaum and drew 13,000 plus Vince was forced to protect his own turf. Bottom line, when you look at the whole situation, Crockett had many of the same goals and ideas Vince did, and probably a better roster, but he expanded too quickly (monthly shows all over the US instead of focussing house show business in core areas while staurating rival markets with your TV while hlding live shows occassionally, AKA "The Vince Model") and lacked Vince's marketing prowess, never capitolizing on the merchandise the way WWE did.
This is why I never complained when the IWC roasted Bischoff for raiding the WWE talent roster, giving away match results of taped Raw shows during live Nitros, or flat coppying old WWE stories (Ultimate Warrior vs Hogan, Flair vs Savage, Flair vs Hart). He essentially was copying Vince's old playbook, and for awhile running the plays better. Even when it comes to talent aquisitions I never blamed Bischoff. Where would WWE in the 80s have been without siging Hulk Hogan from the AWA, Randy Savage from the Mid South area (he wrestled in different independents, some associated with his father, clutivating his image, name, and the Elizabeth part of his gimmick there), Jake Roberts, Roddy Piper, Greg Valentine, and Rick Rude from the NWA, Curt Henning from the AWA, etc.
What do I think of it all ? Vince was ruthless and saw an opportunity to build the industry much larger financially than anyone else at the time did. Considering that Crockett & Bischoff did many of the same things to him I dont feel bad for Vince or because of him. In the end, while we as fans may complain that the product suffers from not having smaller promotions where the talent can develop their work rate and characters and the top talent suffers from not having a viable alternative to WWE that can match their national presence and payscale, the industry as a whole is much larger and more profitable than it ever was, and the talent work less days for more money than they ever did.
Ruthless ? Yes - Business Genius ? Yes Again - More ruthless than his counterparts ? Hardly. Remember, not only was Crockett willing to emulate much of Vince's tactics but the other promoters had horrible reps when it came to treatment of talent, payouts, etc. Fritz Von Erich was constantly accused of pushing his sons above all other talent regardless of crowd response or their own individual talent (and covering up for their alleged drug use), Verne Gagne famously demanded a portion of any wrestler's payouts during their time as World Champion (a major sticking point between him & Hogan when Hulk was being groomed to unseat Nick Bockwinkle as AWA Champ), the stories abound.
Vince was at one time a veritable business genius - I do think he was ruthless towards the competition but at the same time so was the competition, in the end he was just better at it.