Although I love CE's weapon sandbox and I consider it to be one of the best in the series, I'm actually gonna go with Reach on this one.
I just loved the Pro Pipe. And the Concussion Rifle. And the Needle Rifle. And the Focus Rifle.
I miss the Pro Pipe and Focus Rifle.
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CE > 4 = Reach > ODST >>>>>>>2 = 3 -CE was the best, every weapon had a role and all were usefull -4 had a better overall sandbox than Reach. However, things like the GL, PL and FR bump it up to equal standings -ODST is included because the dual wielding removal buffed weapons like the spiker and the silenced weapons. -2 and 3 were horrible. Poor balancing, redundant half weapons, useless automatics ect.