Well, aside from the bugs, I've found it to be a great game. I'd put it somewhere between syphon filter and MGS as far as gameplay. I certainly wouldn't mind seeing a sequel.
Most of the bugs I've run into so far have to do with freezing. The most prominent I can think of is when I'm on the third floor of wolfpack hq at the sub-boss that says, "He was my brutha." If I die there and choose exit instead of continue, it would freeze at the sega logo. Another bug would be where I get stuck on the bike behind an object and the computer just moves me to an open spot on its own.
I wonder if some (not all) of these bugs aren't caused by the system overheating. My system froze once during a bike session and I noticed the unit was quite warm. I took it apart and I could have cooked bacon on the mainboard. And they've got these screwy plastic-type pads over both the main CPUs to keep the metal plate above them from touching the board. But those things have got to be absorbing some serious heat. I think I'll start a new post on DC cooling methods, see what people come up with.