The games industry is fueled on basic rip-offs.
You think Bejeweled was made by a tribe in the middle of Africa or something? - no, it was made by some guys who got the idea after playing Columns, Logical, Puznic, E-motion...
Personally I think it's fine when the game is decent, when the game is not a rip off, then it's perfectly fine - example... GTA rip offs.
Total Overdose:
It appears to play like a funny incarnation of GTA, but really it sucks, not gonna go into details - but it's a turd.
The Godfather:
It appears, and in fact does play a lot like GTA, except in a godfather setting with hoods and mafioso guys etc. It adds some new stuff that is very welcome, like the ability to look out windows, even smash them and start plugging innocent pedestrians. It's like a cut down GTA, but it is a decent game.
Some companies take an idea and milk the hell out of it, some try to at least satisfy fans and don't rely on evil marketing departments everytime to sell their game.
Star Wars: Battlefront is the best SW game on XBox because it's taking it's ideas from a classic game, and it does work, I doubt I've played any SW game as much. If not for BF1942, we'd still be playing games like that Rogue Leader thing with all the FMV - that was a dark and ugly place that we don't want to return to
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Aegrescit medendo