Weclock: no, it's not about legal dealings, it's about the market.
if they release a really shitty dante's inferno game, the market isn't going to want to play or hear about another dante's inferno game, unless it's done right and completely different without any association to the previous.
not going to happen.
That's why, it's because you will lose market interest. nobody is going to want to play it so soon.
And then there's the whole brand association from a company, the company who releases it will be confused for the company who released the shiatty game. It means poor sales.
It is not financially sound to create a game on the same topic of a game, that was just released and is shiatty as all hell.
While all valid concerns, it's been my observation that (unfortunately) consumers have pretty short memories. While releasing two titles based upon the same work within months of each other is probably a bad idea, wait just one year and there aren't that many consumers who will remember or even care about the first title (especially if it wasn't particularly memorable to begin with). Branding and marketing also are key; if the second games looks, feels, and is pitched the exact same way as the first then naturally there will be people saying "didn't I already play this, and wasn't it bad?" But if you have a completely different game, created by a different company, branded and marketed in a completely different way, then it's pretty much a clean slate. Hell, depending on how it's done all but the most astute consumers probably wouldn't even notice that the two games were even based on the same source material.
So what it ultimately comes down to is that if you have two games that are basically carbon copies of each other and the first one was shit, then yes, naturally there won't be much interest in the second. Although I doubt many would complain that a carbon copy of a shit game went unmade. On the other hand, if the game is done differently enough (and if the first game was terrible the second certainly should be done differently) then there simply isn't going to be enough similarity between the games (both in fact and in appearance) for consumers to notice and sales to be significantly affected.