Doom 3 sold 3.5 million copies by 2007. It's also available for Mac and Linux. I don't know the current status of Thief source, but I'm guessing Doom/TDM is much closer to standalone. Doom 3 was released in 2004, so it's been around for nearly 8 years (by August 3). That's close to around a decade. As for Thief being welcomed and wanted, I guess you're done buying (on the cheap) or playing other computer games. The TDM community is established, comfortable, and the members go out of their way to help newcomers, solve technical problems, etc. I'll let others judge how "comfortable" TTLG is, since I haven't paid recent attention. When TDM 1.0 was released, it was at a point where it had everything that it needed to work. All updates since then are icing on the delicious cake, and if updating TDM is some kind of pain, I must be numb to it. I'm sure you've never played a shit Thief FM. Quality varies, you know that. More talk here of "settling-in" and "familiarity" for a game that has been inspired so much by Thief's gameplay, yet introduces visible improvements, like better mantling. There is no game in the world that is more like Thief I+II, so I guess you shouldn't bother playing Dishonored, Deus Ex, Skyrim, or any other stealth games or new video games period. TDM is so far in up the comfort zone of Thief players, that I just don't believe that these "contented FM lovers" either exist or aren't lost causes. Repeat after me, TDM is like TG+TMA, not TDS. Maybe these TDS victims need treatment for PTSD if they are having flashbacks. Are you secretly RMS? Thief has also not been free for most of its life. Last time I checked, it technically wasn't. And I don't see myself firing up vanilla Doom 3. TDM is a total conversion the last time I checked, and I haven't had to see the workings of Doom 3 since ever. You can even hide the Doom 3 shortcut on the desktop if you wanted to. I play on a dual-core laptop. I wonder what would happen if these old systems try and run King's Story or Lord Alan's Factory or Mission X. You heard it here last: you need a better computer to run Thief. I won't tell potentially poor people that they need to buy a new computer for the sake of gaming, but I'll just point out that the self-fulfilling prophecy of Moore's law has delivered in the 11-12+ years since Thief was released. If I'm not mistaken, today's consumer-oriented systems rival or at least approach the world's fastest supercomputers from November 2000. A new computer a decade sounds good enough for somebody. TDM is an easier to set up and play than Thief. 1.08 and future updates will make it even easier. We have serialized campaigns, campaigns, and the Crucible campaign is coming. The "struggle" of a new feel is pretty much nonexistent for Thief "FM players in large numbers". It's much easier than introducing the game to say, non-gamers or non-stealth-gamers. If you are a Thief FM player who can't get TDM mechanics, you may want to tell someone about it, on the forums. Thief is not home sweet home, no matter how marvelous. You said it yourself, the Dark Engine is the "finalized version" (ignoring OPDE et al). It's an aged, closed source game with declining FM output and the glory days seem to be long gone (disclosure: I haven't checked the new FMs for a couple of months to look for any bombshell missions). We are advertising a better product that is by now more fun to play, allows mappers to do much more. Sure, we can't to do anything for people who are too far entrenched in the comfort zone. Ignoring the old and broken talk about the learning curve, TDM is indeed a large game, but isn't anything special compared to Thief. TDM isn't DVD-sized, some of the FMs are smaller (and assets being added to the core mod explain some of that), and it's easy to burn through hard disk playing Thief FMs. I've got 5+ GB of Thief FMs on my hard drive right now. You can always load up the game and play an FM. Use quicksave and quickload to beat up on an AI for a handful of times. An effort of maybe 60-120 seconds. As if that wasn't already trivial, we have a Blackjack Trainer map. It's on the in-game downloader and we recommend that to anybody who talks about having trouble blackjacking.