Originally posted by The_Tempest
I'd say it's more of a reassessment of his placement than underestimating, really. Most of Bane's best feats occur on Force nexuses or are performed whilst wearing or in the presence of Force-aiding paraphernalia {e.g. orbalisks}. He's superb for his time and good in any time, just some of us {myself included} rank a lot of other really good people higher than him.
I don't think we should discredit Bane's feats just because they took place on nexuses. There's only so much these nexuses can amplify in terms of power. It'd be foolish to assume they boost anything more than 15/100, maximum. I know it's difficult to actually quantify exactly how powerful one is off nexus when feats are accomplished on them, but it's fair to assume that if an individual is capable of performing such powerful feats on a nexus, he'd be capable of replicating them to a slightly less degree, or at least something close to the power shown on the nexus. And that's not mere speculation, that's based on what we've seen from SW characters.
While it is true that Orbalisks give a great advantage to RoT Bane, they are essentially just extremely tough armor and adrenaline stims, if I remember correctly. Whatever Force feat he performed whilst wearing the Orbalisks, he would definitely be able to perform without them.