As much as I like minimalism in HUD design, I'm not hardcore enough to choose to use it when everyone else get a fully working HUD. More power to the people who do it, I respect that they dare give themselves that handicap, but in my eyes, it's about as tempting as deliberately choosing to spawn in with only half the ammo and equipment as everyone else.
About the minimap and ammo counter - it's amazing how fast you adapt to playing without them, especially the latter.