Still have to disagree with you. Clemente's career percent stats are aided by the fact that he, tragically, never experienced a major decline phase. Take Rickey's age 36-44 seasons out of the mix and I bet the numbers are more similar in SLG and OPS.
Let's compare their WARs. Clemente's 5 best: 8.4, 7.4, 7.3, 7.1 and 7.1. Rickey's 5 best: 10.0, 10.0, 8.6, 7.4, and 7.4. So, Rickey's 3rd best season is better than Clemente's 1st and Rickey's 5th best season is as good or better than all but Clemente's 1st. Rickey's 1st and 2nd best seasons were worth a combined 4.2 wins more than Clemente's.
I know the SB is overrated, but not when a guy steals 1406 bases at over an 80% clip. As Bill James wrote, "If you cut Rickey in half, you'd have 2 HOFers."
I think WAR is an overused and somewhat flawed stat. I will never use it to compare two different players from two different era's. There are just too many factors involved, one of which is what would be an "average" player in the 1960's vs. the 1980's. The WAR stat only uses the current model of what an "average" player is. It doesn't account for what an average, replacement player is in the 1960's.
I still think you have to look at each player in context to the era they played. As pointed out before, the 60's was a pitching dominant decade so obviously the offensive numbers wouldn't be as great as they were in the 1980's or even today for that matter.
And as I pointed out, Clemente is easily in the top 5 defensive outfielders the game has ever seen. His dominance at defense along with Clemente's brilliance at the plate makes him a better outfielder in my mind than Ricky.
On a side note, what impresses me from looking at WAR leaders all time, Albert Pujols is already ranked 47th all time in WAR at just age 31. Its going to be interesting to see where he ends up 8-10 years from now on this list.