IMO Eldar play much differently than the other armies in 40k, not only in fluff by actually on the table top as well. It is important for Eldar to be able to have superior deployment, speed and maneuverability, then to rely on their specialized units to complete certain roles, but they also need the support of other units to do this. These are the keys to playing well with Eldar.
Things which have been taken from us in 6th, however looks like we will get some of these back:
I.e. Placing fire dragons in a tank then moving straight at a target to jump out and destroy it, will get them killed as soon as you pull this move. *granted they will take out that armour of elite squad in the process.
However, if you infiltrate some scorpions close to that key squad or armour, then you send in the tank with dragons and an attacked farseer (say with guide or fortune, or combos). Then you pop them out and buff them with the Farseer shoot away, and then use the scorpions to clean up the mess that would otherwise go straight after the dragons, so they can hop back into their transport and move to another supporting position. (this is an example of how Eldar need to be supported by each other)
So if we take a look at some of the new rules, we can see how this tactic has gotten better:
Improved Sv on the dragons
Improved shuriken pistols on the scorpions
Stealth on the scorpions
Improved holofield on a tank (combined with jink)
There may be more, which I could find with the dex as well. Considering that IMO and experience in 6th, it has turned more into infantry heavy armies who rely much more heavily on shooting than anything else “these type” of changes will help us very much.
I think if you start comparing Eldar to marines they will always look worse, the same way daemons looked worse but are actually a very playable army
Eldar tactics are more than just stand and shoot, then rely on Power Armour across the board to get us out of jams.
A lot of what I am hearing about the new rules on here and stuff don't seem all that bad to me, there are 2 new rules alone that will make our Eldar Armies instantly better and that is the change to Shruiken Weapons (ap 2 on wound rolls of 6 will hurt everything) and being able to "run then shoot" (or is it "shoot then run") will increase our speed big time, let us close a little more ground or put that needed few extra inches between our enemy. Also, improved Ballistic Skill on guardians helps as well. Throw in the fact that we have some new units/IC/Flyer/Physic Powers/Our own warload trains are all improvements.
Well if that's the case then they failed horribly at that, too.
Most of the Exarch powers are a waste of points, there's only a few good ones, like Fast Shot and Disarm, but in only a few instances do these even justify the purchase of the Exarch in the first place..
However, I’m not sure what I think of the Exarch changes, I feel that they should be able to improve the squad as a whole and I do believe that it is in their fluff to do so. I.e. in the “Path of the warrior” a normal Eldar artist choose to follow the path of the scorpion before getting so lost down it that he became an Exarch then eventually was even rebirthed into the Phoenix Lord in the heat of battle. Still, throughout the book as he progressed along the path with training and in actually battles he/squad were all influenced and improved by their Exarch, so I guess this is where my ideas of the Exarch improving the squad come from.
Rune priests will be nerfed when it comes around to thier dex being updated. GW is working hard to make it where you can not auto deny psykers. They want all those big flashy spells going off.
With regard to the whole PP thing, all then new 6th dexs have their own PP that are mostly better than the ones in the BRB, and now Eldar are same field, so will all the new dexs coming out hopefully. We all have to roll to get the powers so we may not be able to select the ones we want, but neither can any new dex out there. (this is just an evolution Change to 6th so..)
Similarly, thus far in all the games I have played in 6th I have yet to get a Warloard trait that was actually useful to me at all (RBR ones are not that good for Eldar IMO, the few that are can only be obtained through pure luck), so this was a new aspect of the game that didn’t help our army much, but now we have our own!