of the last 4, 2002 and 2010 were the two worst world cups in my opinion.
2002 I felt lacked genuine quality; and when you have a semi final consisting of; South Korea; Germany (they were average back then), Turky and Brazil, it pretty much sums up what I mean.
2010 was simply terrible from start to finish and I thought apart from Spain, the teams really did lack of star quality.
I did like 2006 quite a lot, it's not because of Italy simply winning it, but it represented the end of my nostaligic era in watching the last tournament with the best players I grew up with; for example Ronaldinho, Zidane, Nedved, Ronaldo etc. The big teams also played a lot better and I thought there was plenty of teams whit great squads.
2014 Has been the most entertaining of the last 4, I believe generally speaking that international football doesn't really have their star studded squads like they used to anymore, but in terms of excitment and entertainment of the games, I don't think there's ever been a more entertaining world cup.