Well yea, 3 rings, no MVPs or Finals MVP's (altho Manu is as close as u can get to that in 2005).
They were both considered "second options" to Timmy and Bird, but at least we know from watching the games that Manu is more important (or has more claim on) the rings he's won than in Kevin McHale... who IMO a great player but incredibly overrated and owed a LOT more to the presence of Larry Bird then Manu does to the presence of Timmy (which im not understating in general, just in comparison).
Manu has also brought his own style of play to the NBA, which a lot of players cant say theyve done. Even greats like Kobe for example have openly acknowleedged that they've taken all their moves from the players before them and put it all together... Manu on the other hand is almost impossible to replace largely due to his unique style of play and skill set.
So basically, if a guy like Kevin Mchale (or even Robert Parish) can get into the Hall, Manu's NBA career shud be just about enough to see him thru as well! If you add in the Intl career its a lock!