Count me in the camp of loving it. Finished it on story mode last night and had great fun. I love the tone, and most importantly its a very satisfying lightgun shooter. The combo system is great if occasionlly spoiled by slowdown while in the midst of unleashing fury. Speaking of slowdown, its the only thing that really annoys me about the game although it can be easily overlooked due to the amount of fun to be had. But what irritates, and is a pet peeve, is that much of the scenes containing the most significant slowdown involve fire or other effects such as fog. Now the game looks great without these, so why oh why, if these effect cause the engine to chug, aren't they just removed. I would much prefer it play smoother and to sacrifice an effect or two, especially as it looks great anyway.
But it really doesn't hamper the enjoyment of the game, the music is fantastic, the guns feel meaty, the game flows nicely, the combat is satisfying, the game is long for a typical arcade lightgun game with lots of replayability, the voice acting cracks me up and the handcannon makes me smile, really motherfucking like it. Haven't had a chance to try it 2 player yet, so looking forward to that, its a shame there are no online scoreboards. I hope it sells well so they release another. I would like more of the same except without slowdown and a few more mini games. This and Flower (which is a bizarre combination) are the two games that have got me back into playing after a month or two of struggling to start anything.