Complicate game mode is not appealing?
 

I recently have a really fun gameplay ideas for Zombie Mode that revolved around Human building and defense against the Zombie and Zombie try to attack (kind of similar to base builder) but when I actually look around, I saw not many people in CS community actually into complicate mod

Most of the famous mod are rather simple and keeping the core as only focus on shooting the enemy only. Some more complicate mod like Zombie Panic, PUBG,... are not popular even though a lot of work have put into it. Recently, one of my friend gamemode: All-star, got negative feedback that it is boring though it is really basic TDM with many character, each with unique Mechanics.

So I really have to step back and wondering:

Re: Complicate game mode is not appealing?
 

There's a lot of zombie mods and servers. Most of them are group up and shoot a zombie until he cant move anymore and disconnect. Boring. Unbreakable sandbags, unlimited ammo, goldenaks, 1000000hp zombies, frost nades. Looks cool listing them up but all of these makes the zombie gameplay experience unfair. p2w basically