How does it suck? What is a criteria for a valid build--finish the game, be the best possible build, or do all possible content in the game?
Should a build be OP at level 1, 5, 10, 20, etc? How long before it's considered 'online'?
I'm not trying to pull a Josh Sawyer and demand complete balance. On a fundamental mechanic level, stealth gunplay sucks. You shoot a dude in the head with a silenced pistol and it takes away like 20% of his health and everyone in the entire area then immediately knows where you are and you're in all-out combat. And that's without mentioning the missions that drop you into combat immediately and have huge bosses aware that you're coming. None of that is about effectiveness at all, it's about basic mechanics not working with the playstyle.
If you stealth only works properly... as in completing a mission stealthily... when you hack and use melee, then you shouldn't offer other stealth build options that frankly don't allow for stealth.