I've also experienced performance issues with RDF stores, but over the last few years, that has increased a lot and I think in another 1-2 years there will be a bunch of stores that are able to handle reasonable large numbers of triples with a good performance.
Aside from that I think, although RDF might not be the 'holy grail', it is in fact quite usable for a lot of problem domains and saying that it needs to be discarded is a bit harsh :)
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I've also experienced performance issues with RDF stores, but over the last few years, that has increased a lot and I think in another 1-2 years there will be a bunch of stores that are able to handle reasonable large numbers of triples with a good performance.
Aside from that I think, although RDF might not be the 'holy grail', it is in fact quite usable for a lot of problem domains and saying that it needs to be discarded is a bit harsh :)