Still no popcorn. I think breakfast cereals will have to do.
Scion said:
Well then stop whining hong.
Yea, hong, cease your whining

It was made perfectly clear that the sole (and quite sufficient) reason for the change was the game designer in question not having a Degree in Maths.
Sneak attack is one of the easiest abilities in the game to negate, this has nothing to do with crits.
I disagree. Immunity to crits is really the only thing that can give you total immunity to SNEAK ATTACK. Uncanny dodge? You still can be held or otherwise hindered from moving, and the rogue can still feint you, and flank. UD and Improved UD? There's still the possiblity of feints and immobilization. Feints can be made less probable to succeed (sense motive), but not be cauntered outright. You can get Freedom of Movement, but that won't be able to protect you all day, and it can be dispelled. So the only surefire way to defeat uncanny dodge is to be immune to crits.
My opinion on crits: I think they should be something special. I like the word "Thread" said in slightly raised voice, and the shouts of "YES! CRIT! when you score one. But that won't happen if you have a threat range of 12-20, or even 10-20 or something with this PrC or other. Than it's usual that every hit is a possible crit. Don't give me the "you might not hit with everything below 15 anyway!" line, for unless you design everything to have very high AC, only to defeat the high crit range of one of the players, chances will be that their AB is sufficient enouth to hit with their first 2 attacks most of the time, and therefore have a very good chance of scoring a crit, and the other hits will be either misses or threats, due to the high threat range. Where's the excitement in that? Sure, you can make the DM happy when you tell him that this isn't a crit, but crits won't be great any more.
And then, we're usually talking about weapons that are loaded with special abilities that fire when you score a crit, so they will further increase their damage with those weapons.
Also, the d20 rules are made to be used by a lot of people to create a lot of additional material, so the system should make sure this myriad can't be abused too easily. If you allow improved crit and keen to stack, you set the precedent for Greater Crit and Advanced Crit feats - both of which come from totally different sources, as well as the greater keen improvement, or the Higher Crit special ability of a PrC. But if you say that no two crit range improvement abilities stuck unless ruled otherwise, you can have an improved keen, which gives you 3x the normal crit range for a +3 market price modifier in one book, the Greater Crit Feat, (which requires Improved Crit and does Stack with it, like stated in the Special paragraph of the feat write-up) who further increases the range beyond Improved Crit in another, and in a third source a Higher Crit ability of a PrC who increases the threat range by two. Now you can have a further improved crit range (for the right price), but since these sources don't stuck with each other unless it is noted in the description, you won't have someone who uses them all together to have a threat range of 2-20.
[EDIT]Oops, wrong word, there. Changes in Capitals.