如果先玩2再玩1估计你会玩不下去……1就是个RPG套了个FPS的壳子，操作很别扭，但是可探索区域超大
穿甲弹一家吃遍天下肯定不行，穿甲弹只对装甲和HP有效，warp弹只对装甲，屏障和HP有效，下面是wiki的资料
穿甲弹Rank 4
Choose to evolve the power into one of the following,
Tungsten Ammo
Advanced tungsten carbide rounds in discarding sabots increase the damage done by armor piercing ammo.
Recharge Time: 1.50 seconds
Duration: lasts until overridden by another ammo power.
Armor and Health Damage: +70.00% weapon damage
[edit] Squad Armor Piercing Ammo
Time spent custom gunsmithing allows the entire squad to gain the effects of armor piercing ammo.
Recharge Time: 1.50 seconds
Duration: lasts until overridden by another ammo power.
Armor and Health Damage: +50.00% weapon damage
warp弹Rank 4
Choose to evolve the power into one of the following,
Heavy Warp Ammo
Further increases damage done by warp ammo, which now tears flesh and metal like a miniature disruptor torpedo. Effective against barriers.
Recharge Time: 1.50 seconds
Duration: Lasts until overridden by another ammo power
Damage: 50.00% of weapon damage
Squad Warp Ammo
In an impressive feat of sustained biotic concentration, you can grant the effects of warp ammo to the entire squad.
Recharge Time: 1.50 seconds
Duration: Lasts until overridden by another ammo power
Damage: 35.00% of weapon damage
我建议还走单人强打，毕竟队友的输出比较低，关键还是靠自己，而且非hard以上难度敌人很少带盾带甲带屏障，而且你主角又是soldier，基本的两种弹药都能学满，队友基本就只有放放技能帮你破甲破盾的活了
其实把1代npc的移动炮塔作战精神换回来就好，那子弹技能用处就那样。