also theres a location supposedly on F3 (or I3) in the list of locations thats not marked on their map ...
(downloaded the PDF verson becasue the one they link to with the mini image of it wont load)

how long before UESP has its own map ?

Skuldafn isn't on any map; you can only get there by following the main Quest, and there's no going back again afterward.

The temple itself is outside the game's map boundaries, so you can't even wander in accidentally.

k in that case why doesnt the wiki put in brackets (Quest Locked) like it did with the other shouts on the shout list ?

how hard is http://www.uesp.net/wiki/Skyrim:High_Gate_Ruins compared to the other ruin that had me leave at least twice to restock on potions

(edit: wrong dungeon name)

Compared to what other ruin? LOL I don't know what ruin had you leave to restock on potions! =p

BUT I will say this, as you can see, High Gate Ruins has a dragon priest, so make sure you are at least lvl 35ish, if not higher, before tackling those. And make sure your combat/magic skills are leveled up sufficiently. Boost them with armor/weapon/jewelry enchantments. (it also depends on what difficulty you are playing the game)

theres only one other ruin if Skuldafn is quest locked :/ I have stormcall

It's about the same, maybe a bit harder. Enemies are scaled to your level, except for the priest.