This really is the next step and the engine has really been reworked quite a bit. SIN runs only slightly faster than Unreal on a comparable system. The memory footptint is also only slightly bigger than Quake2, and much smaller than Unreal, which is nice. Software mode . Well like, I wouldnt recommend playing SIN in software mode.
Lets leave it at that.
It works, but you really are missing out quite a bit. A large number of people have already made the jump to hardware acceleration with Q2 anyways though. Still 10hz stuff . The same people who object to Quake2 will probably object to SIN for multiplayer. The Ugly Ok guys, I've got an idea.