Beta impression and aside about betas at large:
Generally no; betas don't change the game other than very minor balancing. Betas - again, generally speaking - are the new version of a multiplayer demo. And while some people cough levelcap on YouTube cough think that DOOM is the hyper competitive arena FPS legend like QUAKE, it's not, and this MP feels a little tacked on. It's a casual's game, and I'm fine with that, it's gory and fun and has metal - as a DOOM fan, I'm satisfied - but it does lack a good competitive base. Not a problem, per se, and IMO, but yeah, the beta shows that gameplay is quick, satisfying and fun, but melee is stupidly broken and the assassinations/executions/glory kills just need to go.
All from an Xbox One experience, by the way. I heard the PC port is abysmal, which is to be expected of a game that (hilariously, considering it is DOOM) went through a stage of development hell that was probably paralleled only by (even more irony) the likes of Duke Nukem Forever.