I've gone to Nipa Hut three times now. I'm not particularly knowledgeable about Filipino food, but I will say that this place delivers on high quality food nonetheless. The restaurant itself is fairly small, lending to a fairly "homey" atmosphere that is very relaxed and comfortable. The entrees stand alone don't offer much of variety, so I prefer to go during their Saturday morning buffets.
The buffet itself is well worth the price. Tea is complimentary, and aside from that the buffet has a wide variety of meats, vegetables, seafood, and desserts. I find it very admirable that Nipa Hut doesn't hold back on authenticity, opting to serve dinuguan and whole fish (with bones) as part of their buffet options. Their spring rolls are very good, and taste homemade as opposed to store bought. The various stews and stir fry dishes are also great, though I can't say I know much about their names or what's in the dishes. The barbecue chicken, while simplistic, is deceptively good, having been smoked for very long periods of time.