I agree that Triple H deserves a lot of credit - whether it should be as much as The Rock and Austin is up for debate.
Faces are always going to get more credit than heels, Austin and Rocky are two of the three biggest faces and wrestlers of all time (Hogan is the other one in case you peeps were wondering).
The top five for the attitude era IMO were 1) The Rock, 2) Stone Cold, 3) Triple H, 4) The Undertaker, 5) Mankind.
Triple H feuded with The Rock from the DX/Nation days over the Intercontinental title to them main-eventing multiple PPV's for the WWF Title (god I wish the belt could be called that again.......). Triple H also had very personal and intense fueds with Austin and Mic Foley.
IMO Triple H was awesome during the attitude era, I remember thinking Survivor Series 1999 was going tot be the best main event ever. You had Triple H, the WWF Champion on top of his game, had put Austin out at Summerslam by attacking him after the match, had blasted The Rock with a sledgehammer at No Mercy and had feuded with him for over a year. Then the challengers were both equalled popular, the fans were split on who they wanted to see win the WWF title. Thats what made Triple H so good, you wanted to see a Stone Cold or a Rocky or a Foley beat him for the title. Back then he drew heat and made The Rock, Foley and Austin more popular.
Watch Unforgiven 1999, The Rock was about to win then the British Bulldog whacked the Rock with a chair, Pedigree, over. The whole audience went silent cuz Triple H had beat The Rock, their idol. 30 seconds ago they had been going wild when The Rock hit the peoples elbow and then HHH broke their hearts. Backlash 2000, the pops for Austin returning and The Rock winning were huge! This is because they are both popualr but also because it meant Triple H lost the title, IMO Triple H made The Rock and Austin even better because he was such a good enemy to them and that is why he does deserve a lot of praise, more than he gets ATM.
He wont get the same level of praise as The Rock or Austin though because he was a heel, heels don't really garner as much praise as the babyfaces, or certainly didn't back then (maybe changing a bit now with Orton, Edge and Jericho, but that could be due to the lack of a mega face like Rocky or Austin, Cena is not as popualr as these two unfortunately).