AW is far from OP, is good but you have to give up something from mage... AW+BM (with caster turned into a warrior using blood magic to cast) is not that good too
AW makes for a pretty strong warrior but i noticed some troubles to hit mobs (at least at higher difficulties) so, as you kinda need to keep magic high or to adjust with other stats you cant spend that much on const...
a full AW in massive armor with war buff on will use twice the mana/health to cast spells and will probably not use staff or gloves to boost the elemental damage... also, as BM have just 1 heal is not that good to happy stay on the front line with BM up not to say to cast spell using maybe 70-80 hps for a single spell
AW for defensive purpose (no main AW buff active) is good, but again he is going to spend more mana/health and probably still have a bit less effective spell, BM here can work ok but is far from OP
AW for just the 3rd level buff can be ok too, the buff is strong and works well with BM but you are going to spend 3 spell slots into it
as said AW makes a pretty good fighter, who can act as a buff bot for his comrade and do some backup healing or CC if needed but is hardly as some people depict it as... stronger than a fighter and with some casting capabilities as a mage... it is a strong spec but hardly OP, BM and SH are as good, just less "flashy"