There are several radically different changes GW has made to the game. For the first time since 3rd edition, the stats of units have changed a lot. Armor values gone, different movement rates, no templates, there are a bunch of changes to the game.
I've played 3 games so far, in the first, I really struggled with the new rules. I made plenty of game mistakes. I took the Craftworld Elder out for a spin against Derling's marines.
Both of us were 8th edition virgins so a 60 power game took us about 5 hours to play. That said, it's going to take practice to have a grasp on the new unit stats. Derling took the game, it was close but I made too many tactical errors to overcome.
|3 Penitent engines prove too much for the Avatar.|
|Defenders handle themselves well.|
|The Avatar proves it is a strong play for the Eldar.|
But there are things I think need improvement. the terrain and cover rules, no more fire archs, for flyers especially, and I miss templates.
Of course, I'll gave it more games to really get a feel for these new rules.