As of now, 63% of the players that tried DOOM Open Beta, on Steam, gave it a negative review. Meantime, Id Software has prolonged the Beta period for one day and unlocked the frame rate for the PC version of the game. Most players don't like the slow speed of the game as well as Loadouts. Other concerns include content hidden behind XP wall, absence of the iconic DOOM gameplay elements as well as Halo'ish feel and look of the gameplay. Having played the Open Beta, I agree with most concerns of the players.
If you want to build up your own opinion, here are some links for you:
DOOM Open Beta on Steam, for PC
DOOM Open Beta in Xbox Store
DOOM Open Beta in PlayStation Store