BR kills faster than the AR assuming you shoot him first, or at the same time, and don't miss a shot.
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The only issues I have with this game are small ones. A compendium of small ones, to be exact.
-Maps are static, and are just Geometry, unlike previous halo titles.
-Spawning with precision weapons can be fun, but also a pain in the ass when the other team is a bunch of try-hards who are right at home at the start of the match.
-Weapons dropped from players staying on map for less than 15 seconds
-Extremely powerful Ordinance is a double edged sword. It can be fun at times, but on BTB, power weapons from drops really de-value vehicles.
-Not enough small maps
-Lag, while temporary until 343 gets it sorted out, can be a nuisance.
-No X's over dead teammates, only on radar.
Otherwise, it's a breath of fresh air in the series.