Yes it is. Every 1shot faceroll scenario is just plain stupid if you take it for granted and your victim cant do nothing about it cause of your invisibility. What about BG 35 hexing you for 500 dmg every burst? Sounds ridiculous enough? Like i said, its just plain stupid. Peace 
Do you know that you go out of sneak when you enter combat? Yeah, so the sneaker bursts you(from distance its 150-200dmg), and if you don't die, you have the chance to find him and kill him. Because he won't be able to enter sneak if you see him, when the tag feature gets fixed(will it?)
And note that you need to
fucking be turned back to the target for him to crit. So the BG 35hexing for 500dmg isn't a good comparison at all.
I dont like the idea of sneak-suit, because without it, you would render one skill completely useless. You dont need special items for other skills, they just give slight boosts.
You do need special items for other skills.
You need guns that belong to the small guns group, if you want to use the small guns skill.
Same with big guns, energy weapons, melee weapons.
But besides the irony, partially I agree, sneak should be useful without suit as well. It's just a matter of numbers, penalties or bonuses...