probably devil may cry, the original. It;s been a letdown to me since.
I sort of agree, although I'd say it peaked with three. Four was more of the same, and five seems to be too so far. Still fun though.
I sort of appreciated that they tried something different with DMC for this reason... but that game was just kind of pretentious.
While on the subject of Capcom, I'd also add Dead Rising. The weapons were fun in the latter games, but the tension died out and it felt more like a beat em up than a survival horror.