At the least, against any single, unaware target I see the rogue be the one-hit, one-kill wonder.
The best way I saw to accomplish this (via houserule) in 4E was the "minionizer" rule. A guard or wandering monster would have normal stats as a standard monster, but if they were able to be taken by surprise and attacked from stealth... they were considered to be minions for that first attack. So if the Rogue (or whomever) attacked during the surprise round and hit... the guard/monster would instantly go down (since they were a "minion" at that point and any damage would kill them.) If, however, the attack missed... then the guard/monster regained his standard monster stats and could go into combat with the formerly-stealthed PC. The PC then had to decide whether to engage or try and run away.