Akainu at least got to show off at Marineford, the other two might as well be blank slates with some lofty titles (no, bullying Don Krieg and cutting a piece of ice don't count as feats).
I think "disappointed" is a strong word to use, but I have waited so long for any of these three to do something grand that when they finally do it now, I will still probably think it's cool (I'm an easy man to please) but had that happened 5 or even more years ago, I would have been more hyped. Now I will just think "finally, something cool out of this guy" instead of just "OMG he just did something fucking cool!".
Ten years of WEDDINGU CAKU and endless irrelevant minor Wano characters took their toll on me.