That "everything simulator" meme is getting old, but this game is actually fun - I was expecting something a lot more shallow, while this was obviously made by people that love messing around with PCs. The computers have a BIOS, you connect the cables individually, etc.; it's not accurate, but it's accurate enough. Then you have emails from customers, a review site, you have to remember who wanted what - so you have goals, it's a real game, not just a sandbox.
You know those games that you get super excited about, but then it turns out that the thing you were excited about was just a gimmick, so you play for two hours and then never again? This ain't one of those games. I've had it for several weeks now, and keep coming back for more. Rock solid gameplay, awesome music, amazing level design that probably couldn't have been done that well in any other engine. Otherwise, some people complained about the gun selection, but I think this was mostly because they didn't notice the alt fire on the cluster puck (as the complaints are usually that there isn't anything BFG-like). The weapons are great, and the bowling bomb became one of my favorite FPS weapons of all time (chuck 'em behind corners, chuck 'em in doors, chuck 'em in holes, and just watch for the giblets - if pieces of meat are flying out, then the bomb has found a target). P.S. Ignore the 1-star reviews. Those are politically motivated, no sane person would give this game 1 star.
Weird car handling, flawed progression, questionable level design, performance issues*... it's definitely a Carmageddon game, no question about it :D * The performance issues were probably patched; some early reviews talk about them, but the new versions run absolutely fine.