KINDA, but monsters are much more 'front-loaded' than PCs in general. They have all their hit points up front, so they have quite a few more than a PC does (median 30hp for a level 1 monster). Some fighters may be in the same league, but generally monsters have quite a lot less hit point potential (standard heroic tier monsters have one HS and no way to access it as NPCs don't get to use the Second Wind action). A PC fighter might have the same 30hp, but he can, and will, access 2-3 healing surges if needed. Monsters also have less damage variance, their primary alpha strike is less potent than PCs best dailies, and they generally only have one 'big move'. They're designed to rock the PCs back onto their back foot and then fade. IME if you put standard monsters vs each other the result is VERY sloggy as once they unleash their encounter power they just beat on each other for modest damage for a number of rounds. Its possible to construct some interesting monster vs monster group fight scenarios, but you have to pick your monsters. An Orc Warrior really plays a lot differently than a fighter, whereas in 1e at level 1 they were virtually identical in play, neither one having any explicit options except move, charge, and attack, or launch a ranged attack.