I finished the story mode in Dirge of Cerberus tonight, and from start to finish, I thought that it was a great ride. It's not an eleven point awesome, but it does pretty much everything it sets out to do well, and with enough flourish that it remains fun and interesting from beginning to end. There are only a few different weapon types in the game, but the customization system provides a surprising number of options to choose from as the game goes along, and really, I'd settle for a few weapons that are good fun to use than have a sea of weapons that I'm never going to bother with.
In short, I pretty much disagreed with every single negative point in Greg Mueller's review. As a matter of fact, I can't say that I've ever been fond of his review style, which is seemingly to take a game and gleefully tear it apart, positives be damned. To paraphrase another GS regular, it's like he's the website's official anti-RPG reviewer.
I'd recommend to anyone reading this to at least rent Dirge of Cerberus through whatever method you prefer and give the game a shot. It's not something that will be for everyone's taste, but it's certainly a lot better than Mueller makes it out to be.