Most Iconic and memorable WC for me,
1) Germany 2006 - It was impressive. Many entertaining games from start by the host and the rest of the team until final. Group stages are all so good. Italy were also fun but I felt the host stole the whole show with Schweini, Klose and Lahm the standouts imo, I think my interest in football and the way Germany play started here - systematic and efficient yet also entertaining. Also, the wink, Ronaldo and Rooney moments were too memorable leading to the next awesome EPL season where basically "United is back!". The last time I also see Brazil's unique gung-ho top attacking yet winning with good defence playstyle. This tournament also have the best logo with that 3 smiles (IK it's not too important but definitely had a mark on my memory).
2) South Africa 2010 - Waka Waka, let's face it, that opening is so good and catchy. Germany with new gen breed of young talents with Muller, Ozil, Khedira and Neueur alongside Schweini and Lahm playing awesome football which for me is United-ish. This is also where the France squad controversy happened iirc. Spain were impressive here with their tiki-taka but only with David Villa for me they finally have sharp teeth to win. Fun. Chicharito also delivered eye-catching performances here.
3) Korea & Japan 2002 - Fun and cool. Unexpected achievement by South Korea (& Turkey, were they that good around late 1990s?) reaching semi finals, and the SK players also donned red sprayed hair iirc. It was so fun. Brazil were monster here.
4) Brazil 2014 - mostly boring but memorable in a bad sense where here it's too obvious Brazil is too weak now, no longer one of the powerhouse in football imo. 7-1 is just embarassing. But good side we get to see the continuation of Germany's football. Also, RVP's flying dutchman goal. Lastly, iirc Pirlo showed his class with graceful intelligence here, his final WC I think.
Don't remember much the 1990s.
The most recent one Russia 2018 is mainly so boring, I doze off losing interest in watching majority of the games, don't remember many good moments except for Mbappe's driving France's attacks, Pogba's one hollywood pass in final(?), Meunier bombing up and down the right wing with limitless energy, Fellaini and co stopped Neymar's futile attempts, De Bruyne's cool long passes, and England's younger team bizarre nice cruise to semi. Maybe I'm getting old.