They added a bit of variety, but the game is arguably at its best when adhering to its favorite rhythm of shooting, glory killing, and finally using a chainsaw in order to quickly replenish ammo so that the circle may start over. Bosses definitely break this cycle. Seems like unless you are some sort of melee focused third person game, bosses are a real bitch to get right. At the very least Doom went for old school pattern recognition and evasion skills instead of resorting to quick time events. I was still happy to see them reimagined with a fresh coat of paint. Like with everything else in the game, the artists did a phenomenal job. (and the final execution was so bloody satisfying)