Well EA is all about the right and now.
No doubt Dead Space would a insanely successful IP in 5-10 years if, after the first game, they took more time for sequels and only produced quality extra content, with that I mean no terrible Dead Space animes etc.
But that's not what EA is looking for, never has in fact. The moment they see one of their products being somewhat successful they go all out on it and milk immediately. Which in a short term probably does gain them some more money (which the CURRENT CEO probably likes ;) ) but some more years down the line? Well, there we have another average IP that only does so-so.
I think the problem is that the people at the top are not enough interested in quality game development (not like a Gabe Newell or Mike Morhaime) and want to make as much money as possible right now when they still have the job, as they're uncertain about their own and the companies future.