The entire point of a Beta is to find bugs in the game, by launch the game will be mostly fixed especially if you do your part and report the bugs.
Anyway my first thoughts from the beta are "Wow DICE you have done it again and much better then ever before.". I personally think the game looks brilliant with explosions and particle effects. Keep in mind that Operation Metro is the least Battlefield like map in the entire game because it doesn't have any vehicles and for a Battlefield map it is not very big. They have made lots of great changes to the game and I can't wait to see what the full game will be like.