The SiS315 isnt half bad given the price it generally sells at.
It's got a respectable feature set, decent 2D, and pretty good DVD playback. Gaming performance generally comes it at between that of the GF2 MX200 and GF2 MX400, roughly comparable to the Radeon VE in terms of gaming performance.
Drivers are actually surprisingly good and remarkably stable in 2D Windows, and I've not encountered any real hardware compatibility issues.... it has a number small bugs in 3D though.
If you just want it as a basic Windows 2D card, then it's not bad at all given the price it sells at.
There are certainly far better cards out there, but the SiS315 is respectable and pretty solid for what it is.