I'm still iffy on the idea, if only because of the above. . .
Some people think a (150) "45E" attack table result, followed by an (01) "+5 hits" roll on the E table resulting in 50 hits, nothing else, is a flaw in the system.
I see it more as a good feature. . .odds get really low in E territory that you'll get out not bleeding, stunned or injured, but it's still remotely possible.
This plays into the issue of "How much of combat is skill, and how much is luck?"
The attack table half of the equation, except at low level/low OB, is mostly about skill, and other factors like armor. . .the 1-100 attack roll is open ended with some auto fumbles at the bottom, so luck has a chance of jumping out and throwing the odds totally off up or down, but mostly skill and tactical choices rule the attack table. . .and the results are all about how well you hit the target.
The Critical table is mostly about luck, which it should be. . .millimeters or less can make the difference between a flesh wound or bleeding out from a torn artery, minute variations in angle the difference between skipping off the armor or cleaving into it. . .Essentially every attack is intended to kill, and many attacks don't. . .not because the attack was poorly executed, but because murphy has a hand in any fight. Very few factors can bias the crit. . .and most of the factors just switch the column around, they don't change the crit. . .and of the items that change the crit, the most effective, ambush, requires an unaware foe who allows you to set up a perfect shot on them.
The problem I have with a one table method, is it shifts the bias way in favor of skill and tactical factors. . . so that weapon skill, face to face, is the same as ambush when I sneak up behind you. . .Ambush may still be nasty, you may use the skill rather than the ranks, and allow it to be added to OB to push the result up even higher for a sneak attack. . .and it's not just the offensive side. . .throwing on your plate armor and going full parry then acts as anti-ambush. . . .
Now, some folks reading this might think "Good, skill should matter more, and luck matter less." But, consider this:
In RM, one of the things that make it RM, is that when someone pulls out a sword on you, it's never funny, even if you're 10th level and they're 2nd. . .and a good deal of the reason why it's not funny, is that those A criticals start early, and a 00 result on an A will kill you.
I strongly suspect that any one table method would reduce that fear, because at high levels, with better gear, you can just swamp the attacker's OB with DB, and since luck is being downplayed vs skill, the odds on that smart mouth punk killing or maiming you have gone way down.