I have a close combat specialist with a shotgun and I'm inclined to agree that close skill isn't as good or lasting as others. [...] flamer, which is better in close combat than close skill itself [...] close skill only gets secondary/backup weapons instead of specialized close combat weaponry.
With little hesitation I second Hertzila's post. Close combat proves itself invaluable in close quarters with civilians and aliens mixed together - take any building assault as example. What is needed here is something powerful(like one shot-one kill powerful), highly accurate and with high fire rate - range, obviously, isn't an issue. In-game weapon that fits here best would be particle beam pistol. Something that doesn't fit here as good as PB pistol would be flamer, stun stick, plasma pistol, plasma blade(my personal favorite) and some of the old shotguns and SMGs. That arsenal seems to be impressive, and it does suffice in most situations. However, it would be really cool to see some human-designed advanced strictly close combat weapon - like overcharged laser pistol that renders itself inoperable after dosen of shots, or maybe plasma blade crossbow, or human-modified plasma pistol(grip that is more convenient for humans, higher precision and plasma temperature), or pocket needler.