If I were Nanami... that'd be really weird. But kinda kewl, I guess |DNo, no... If I were Nanami, I wouldn't be that upset about my less-useful power-- I'd be much more upset about this.
I can't agree that Nanami got the short end of the stick with her OVA power. It's saved lives twice, and it saved the balance of power in Roshtaria from tipping into Phantom Tribe hands. Did we all forget about these little details? Although her power is only useful when the Phantom Tribe is about, this power has proved useful on more than one occasion. And of course, essential. The story of El Hazard couldn't havce moved very far with Makoto dead.
Personally, I think they missed out on a big opportunity in OAV2 to make Nanami's ability more worthwhile. When they came across the holographic mountain where Ifurita 2 and Yuba were hiding, they should have allowed Nanami to see right through it, thereby implying that her vision can pierce any kind of illusion. Instead, we can now be pretty sure that her ability is Phantom Tribe illusion specific. Oh, well.