honestly i still maintain the idea that a soft lock deck is viable.
Guardian and ProfessorAlstad are two other people i know who utilize the concept along with myself.
there are a number of characters that take care of sites, but people don't always play them.
also if you have ways to tutor your sites you can set them up relatively quickly. i had a good experience playing a larger deck which used sites for soft locking purposes but were also useful on their own with Fortress of Antonia, Herod's Dungeon, CP, Chorazin etc.
using 1 site such as Hormah or Nazareth i believe is still tasteful as you can choose to play it situationally depending on what your opponent is using.
i do still feel that sites have a place in the meta, however, they must be used wisely as they can become a liability (which in my opinion is good for the game generally speaking)
now that doesn't include the consideration of other locking concept decks..
one of these decks utilizes medium in endor, complainers, either hsr or hhi, and potentially some sites or protector souls (female only, nt only, etc.) along with a forsaken soul with hero swapping/conversion to effectively lock out an opponent..
just some considerations if you are thinking of making a lock out deck.