The first five WrestleMania's for me were the 5 best WrestleMania's as far as in-ring wrestling since that was more of a focus in the early years than storylines & entertainment that it would be in it's later years. Now I'll be honest, I didn't buy the DVD set (I have the WM 1-13 VHS set from almost 10 years ago) so I don't know what's been edited or changed as far as theme music or anything of that nature.
WrestleMania I - The event that started it all with many memorable moments...including Mean Gene singing the National Anthem. There wasn't a bad match there (unless you want to count the King Kong Bundy squash of S.D. Jones) based on the type of wrestling/sports entertainment they were doing at this time. Just me but you can't have the rest without having the baby that started it all.
WrestleMania 2 - This year, they tried having it from three different locations in Chicago, Los Angeles, and New York with each having it's own main event...interesting concept but it didn't work out so well that they didn't do it again. The standout matches here were Paul Orndorff vs. Don Muraco, the WWF vs. NFL battle royal, Tag Team Champions Dream Team vs. British Bulldogs, and the Hogan vs. Bundy Steel Cage match.
WrestleMania 3 - The event that to this day still holds the world's largest indoor attendance records of 93,000+ fans. Bob Uker did commentary and was really hilarious all night. They had the ultimate dream match in sports (not just entertainment) at that time. The standout matches here were the mixed tag match involving Hillbilly Jim & King Kong Bundy (seeing Bundy squash the midget like that was really something to see), JYD vs. Harley Race, Roddy Piper's retirement/hair match vs. Adrian Adonis which lead to the birth of Brutus "The Barber" Beekcake, Bulldogs & Tito Santana vs. Hart Foundation & Danny Davis, Jake Roberts vs. Honky Tonk Man, the memorable match between Hulk & Andre and the wrestling classic between Randy Savage & Ricky Steamboat.
WrestleMania 4 - This was the first ever WWF Title tournament and was about to usher in a new era of WWF since for the first time since WM, Hogan wasn't the champion or even in the main event (at least not wrestling). The only negative I can say about this was that they tried to squeeze alot this one PPV (there were 16 matches) making the event more about "quality instead of quanity" & alot of great potential matches being real short on time to be anything memorable. Standout matches were the 20 man battle royal, Jake Roberts vs. Rick Rude, Bulldogs & Koko B. Ware vs. Islanders & Bobby Heenan, Tag Team Champions Strike Force vs. Demolition starting the longest tag team title reign in WWF history, and the finals of the tournament with Randy Savage vs. Ted Dibiase.
WrestleMania 5 - The Mega Power's Explode was the PPV where you really start to see the "sports entertainment" take effect here compared to the previous four WM's. Standout matches were Brutus Beefcake vs. Ted Dibiase, Blue Blazer (a young Owen Hart) vs. Mr. Perfect, Tag Team Champions Demolition vs. Powers Of Pain & Mr. Fuji, Jim Duggan vs. Bad News Brown (just for those who like brawls), and WWF Champion Randy Savage vs. Hulk Hogan. Also on here, Roddy Piper returned to the WWF with his classic Piper's Pit segment where he had guest Brother Love & Morton Downey Jr...your either gonna love or hate that one.
Basically, this was the beginning of sports entertainment here but this collection gives you the best WrestleMania's as far as "professional wrestling" goes.