Um, no. The NeXT cube competed mostly directly in price and market against MIPS and SPARC boxes which ran rings around it (quite literally 4x faster on typical CPU benchmarks in many cases). It was never a performance platform, and would only fall farther behind as the 68k architecture failed.
There were many things to like about the platform, but really NeXT was a very flawed system. It lacked the speed and features to compete with machines in its price range, yet was priced out of the PC and Mac world where it's UI and integration would otherwise have been attractive.