A lot of these "feuds" aren't even memorable, and don't deserve it.
Rikishi vs. Val was nothing special. Tajiri vs. Super Crazy? LMFAO! Anything to mention a Japanese star AND a Mexican wrestler. How is RVD vs. Lynn underrated? That's a highly talked about and respected feud in many circles, and was a major focal point of the ECW DVD. Anytime RVD's history gets brought up and they can mention Lynn, the feud is talked about.
Also, Mike Awesome vs. Masato Tanaka is underrated!? IN WHAT WAY!? That's one of people's most favorite feuds when it comes to either guy, and especially when it comes to ECW. Their work in Japan was even recognized worldwide for the work they did and how well they carried themselves in the ring vs. each other.
I'll give you a recent feud that people think is good but is much better than good and underrated from the standpoint that they only had one real run with a good build leading into a couple matches, and that's Punk/Cena. Not much of a build to their Raw match earlier this year leading into Mania, which was one of the best matches in Raw history, and one of the better matches WWE has had in the last half decade. It's also highly underrated from the standpoint that they haven't taken that match to Mania yet (albeit because of Dwayne).