The Rose issue actually came about BECAUSE of the Beta. Some of the players decided she was too weak (even though she was perfectly fine) and they buffed her. They're releasing a patch to re balance her and a few of the other classes sometime next week as well as fix some of the bugs.
And the travel back to the current Graveyard/Gravestone isn't meant to be fast. Engineers, however, can still build a transporter to teleport you forward. As for the zombies being weak play some Graveyard/Garden Ops and level up your characters a bunch, and once you've gotten them to the adequate level you can upgrade it's damage, reload, speed, zoom, regen, etc. You can apply up to three upgrades per character and Garden/Gravestone Ops are really easy ways to gain levels once you've gotten a good multiplier going. Which you can do by playing through some of the quests.
I don't really know what you mean about low music levels and whatever this quote means. "...but weak sound effects or no music at all and weak closing videos. I remember quite well the fun and great verbal interaction kids had..."
The sound in the game is fantastic and audio balance like music and volume is completely under your control. That's something you can adjust now in the settings. And I'm assuming the last bit of the sentence is angled towards voice chat between people who played the game? EA really doesn't have any control over that whatsoever.