Here's another unpopular opinion. As prolific and well regarded as the Djokovic-Nadal rivalry was, I think barely even 1/4 (15) of their 60 matches were actually good, let alone great. The majority were just ok or below average. Some were one-way beatdowns without much in them; often, the winner's showing was commendable (RG 2008 SF, Doha 2016 F), but not the match as a whole. Others were close-ish matches that weren't exactly high of quality. Others had good individual sets but weren't that good overall (Canada 2013, honestly also US Open 2011 even though it makes the list)
Off the top of my head, those matches are:
Hamburg 2008 SF
Queen's 2008 F
MC 2009 F
Madrid 2009 SF
US Open 2010 F
Miami 2011 F
Wimbledon 2011 F
US Open 2011 F
AO 2012 F
RG 2012 F
RG 2013 SF
US Open 2013 F
Rome 2014 F
RG 2014 F
Rome 2016 QF
Wimbledon 2018 SF
Rome 2021 F
RG 2021 SF
Even some of these are matches I had to think about before putting them in, like US Open 2011/2013.
Compared to the other big rivalries of that era (Fedal, Fed-Djokovic), I think this one really suffers from such a relatively small percentage of matches being worth watching. Fedal has about the same number of good matches, maybe a little more (my iffy inclusions would be the RG 2006 F and Wimbledon 2019 SF), but out of 20 fewer total matches it's a lot more bang for your buck.
Miami 2005 F
RG 2005 SF
Dubai 2006 F
MC 2006 F
Rome 2006 F
RG 2006 F
Wimbledon 2006 F
YEC 2006 SF
RG 2007 F
Wimbledon 2007 F
Hamburg 2008 F
Wimbledon 2008 F
AO 2009 F
RG 2011 F
AO 2012 SF
Cincinnati 2013 SF
Basel 2015 F
AO 2017 F
Miami 2017 F
Wimbledon 2019 SF
And then Fed-Djokovic you were almost guaranteed a good match whenever they met. That rivalry's big problem was that there were relatively few (if any) truly excellent matches like a Wimbledon 2008 or AO 2012. Even MC 2008 was a good match and Djokovic retired in the second set.
Now granted I haven't watched every single match from all three rivalries (the earliest Nadal-Djokovic and Federer-Djokovic matches were before I started watching) but the ones I have yet to see tend not to be among their highly regarded matches so I doubt I'm missing too much to make this post.
(Probably goes without saying that even the "ok" matches of these rivalries are still pretty good compared to the average match; my grievance here is something that matters more when we compare the Nadal-Djokovic matchup to other legendary rivalries)