I wouldn't really say Halo was ever a true arena game. "Normal" weapons, regenerative health, lower movement acceleration, etc. lean it more towards the modern style of shooter. The fact that the series was able to almost seamlessly transition into a fully modern style game with the addition of sprint and loadouts is strong evidence of this.
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I agree. Halo 3 was really the first if the series to start pushing into that "Dynamic Shooter" genre. I'm still waiting for another UT.