Why should we choose? I want quantity and quality. With the games coming out recently, and going to be coming out around the time of Rage release - it's gonna have some stiff competition. Maybe ID software is past their prime. Maybe not. We'll have to wait and see. All I know is once Battlefield 3 is out - if you ask people about Rage they will be like Rage what? You can only play campaign and co-op for so long. Then you have mario kart races in the middle. If those multiplayer deathmatch maps come out it might salvage the situation.
Also John Carmack was the mastermind behind ID. He was the innovator. He was making headlines. But his interests turned to Aeronautics. He had this company on the side which he focused on. ID released some game engines and fell into obscurity. They popped back, and now that Carmack has sold ID Software to Bethesda he wants to pump out a good game make it a good sale. Release iphone and toaster apps with a version of the game.
"They felt that there was no reason to include deathmatch and they chose they more difficult route of innovation."
This is a nice way of saying we have limited money, and have a workforce of about 10 people half of which are illegal aliens (small extreme but you get the point)

Just because there is no DM doesn't mean that the multi-player won't be fun and whether they add DM or not won't stop people from buying battlefield 3. People will still buy BF3 and they will still quit playing RAGE.
Why would some one buy Rage when they can just say. OH wait RAGE has SP, COOP and MP with infantry combat. BF 3 has SP COOP and MP with infantry combat. HMMM... should i go for something untested or something truly tried and trusted. NO I WILL GO BF3.
Why would some one buy Rage now you ask It has SP COOP and MP with DM with CARS (only other game this year with car combat i can think of is twisted metal and it's PS3 exclusive). Hmm.. seems interesting let me try this concept out else I have BF3 to fall back on.
This is the most crowded year for gaming and what gives id the freedom to do whatever they want is that its a new IP and everyone else is doing everything that they did 10 years back.
Your logic about " If those multiplayer deathmatch maps come out it might salvage the situation." holds no value as people will still bounce back to BF3 and you are forgetting this generations juggernaut of DM's, Call of Duty is still to come not to mention Gears 3 is also on it's way and lets also not forget there is a tribes games on its way. There is only so much battlefield-esque and COD-esque games people can play. As you can clearly see Crysis 2 did the same copied COD up the A** and got screwed in equal amounts. Now let me see I want to play my awesome games that I just listed but then there is also RAGE a new IP. Do I really wan't to waste time leveling up in DM on that when I can spend my precious time leveling up in the above mentioned games which will guaranteed have full servers for at least 6 months post release.
In fact Rage will be forgotten in like a month of their release if the MP is DM like. Also use your head Bethesda has their MP game for this year it's called BRINK. They don't need more competition for that game from their own internal studio.
Plus not to mention all those modders will make a GTA like MP dm which will be pretty cool IMO.
Sorry for the wall of text but your logic is so flawed I had to vomit all of this out.