The problem with hourglass is that the active is so powerful it ahs to be gated somehow (IE, allowing people to get it by building only low and mid cost items would make it too easy to acquire). Because it is a defensive caster item it needs to have AP on it and because it is powerful even in late game it needs to cost a large amount overall, so the best way to gate access to it is by having a needlessly large rod in the recipe. This means that it has to have a ton of AP on the completed item otherwise the rod in the recipe would seem out of place, and this leads to the problem at hand (namely that it is too strong offensively to justify its great defensive ability). The same set of conditions would be true of quicksilver scimitar if quicksilver sash didn't have the active.
TL,DR: Zhonya's is too good not to cost a ton and has to have a ton of AP because it costs a ton because of build path oddities
As far as banner goes, the active just isn't ever strong enough to warrant using the item so unless its stats are already usable it will never be bought. Furthermore, it has the winmore problem. By the time you buy it, either you opponent is already losing and the extra pressure is negligible, or you're already losing and the pushing won't matter because the opponent can clear it safely without a significant loss of pressure.
Same goes for ohmwrecker (if you can't dive this doesn't add enough to hep, if you can dive you don't need ohmwrecker).
Atma's just seems out of place, another item where the ability's not good enough to make it worth buying unless its stats are already good, but the ability is too good to give out for "free" (IE without factoring it into the cost)
I personally think botrk is in an okay place because the combine of 1000 is an effective gate on how easy it is to buy (it doesn't need another gate in the form of recurve bow.
As for my opinion, I think triforce needs tuning (but no serious work). I also think banshee's veil and spirit visage neeed to be looked at because as it is veil is harder to buy than spirit visage, has worse stats, and the passive isn't strong enough to warrant the increased cost. Maybe make it build out of giants belt instead of ruby crystal, only slightly decrease the combine cost, and give it a larger health pool (to make it more attractive for pure defense while spirit visage is more attractive for CDR/lifesteal, thus making spirit visage better for cho for example while veil is better for maybe amumu)
Sorry for the wall of text.
Atma's Impaler (see first reply)
Banner of Command (Needs to be almost gold-efficient on its own, promoted minion could receive the Valor aura from the Banner bearer as long it is alive, creeps hit by the promoted minion and not killed by another champion could give gold to the Banner bearer)
Blade of the Ruined King (ease of buildpath: Daggers replaced by Recurve Bow)
Ohmwrecker (for one, wrong stat combination for tower diving. Secondly, towers could be made stronger if there was a way to counter them better)
Zhonya's Hourglass (atm, simply too rewarding to build: You don't lose much offensive capability for the amount of defense you get)
