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First off, I will be the first to admit that when I saw how Wizards changed Rogues to using the Expertise system like Fighters I was fairly biased against it.  I'm not sure why, but something about it just rubbed me the wrong way.  After some time and actual playtesting however, I feel that it's probably a much more balanced system for Rogues than before and even gives them new abilities and actions to work with. 

However, my one big pet peeve with the Rogue revamp is Sneak Attack.  Previously at level 5 we had Sneak attack Damage of 6d6, now at level 10 we have up to 3d10, which is half the damage at twice the level.  Personally, I am in favor of using less die to achieve high numbers, so the conversion from d6s to growing expertise die is fine, and maybe Wizards felt Rogue Sneak Attack damage was too high before and fair enough it probably was.  But my single largest problem is the comparison to Fighters.  At level 10 Fighters have the same pool of expertise die as Rogues, and their core damage ability "Deadly Strike" can do the same amount of damage potential but under less conditions.  The condition to use Deadly Strike is hitting a creature, for Sneak Attack it is hitting a creature and either having advantage or attacking and hitting a creature in reach of a friendly, meaning Rogue's have to work harder to get only the same damage potential.  The next issue is Fighters at level 6 get to make an Extra Attack  which adds even more to their damage potential.  My big fear is the return of the 4E essentials "Slayer" Fighter which outpaced more complex Striker classes like Rogues by doing superior damage and having to do little to achieve that kind of damage output.

Should Rogues stay with the Expertise system I would suggest a much needed boost to Sneak Attack damage, perhaps a static modifier bonus every few levels of Rogue so that players can't just take one level of Rogue and 9 levels of fighter and get a superior damaging Sneak Attack.  A static modifier of +2 every couple of levels or a more significant bonus spread over every 4 or 5 levels, it would increase our damage output with Sneak Attack without adding more Die to roll and keeping the numbers easy to calculate. 

Rogues are like baby fighters who do less damage because they are primarily a skill monkey and secondary fighter.

In other words rogues should not have expertise dice. It makes them way too similar to the fighter.

I believe the mistake here is that you're thinking in terms of 4e roles. The rogue isn't designed to be a "striker". He's designed to be a skill monkey. There's a reason the fighter gets damage as his free maneuver and the rogue gets skills. Looking purely at combat roles is ignoring the intended purpose of the rogue.

That said, D&D is a game primarily about combat, and the rogue's comparative weakness in combat isn't exactly something to smile about. Perhaps sneak attack does need a buff - adding the Dex modifier for each die spent seems like a good way to go about it, to me.

I dont like rogues using the same system as fighters it makes them feel too much like the same class.
then tack on that rogues sneak attack is more restrictive they get fewer manuvers at a slower progresion rate have a lower attack bonus dont get the extra attack at 6 all to be a little better at a couple skills when the fighter could gist spend 2 feats to get those same skill bonuses.

yeah the rogue is a skill monkey but he doesnt do skills well enough to play him over a fighter who focused on skill feats.