last year in a 10 team 5x5 mixed auction no-keepers:
i drafted 220 hitting, 40 pitching.
my offense was STACKED.
konerko, soriano, tejada,chavez, giambi and a rotating MI in the IF.
andruw, beltran, waker, preston, jd drew in the OF
2 cheap catchers.
my pitching did me in.
my "ace" was a cheap vazquez at 13.
i paid 15 for penny behind him because i wanted another decent pitcher.
penny was a disaster, vasquez had his worst season in years.
the rest of my staff? el duque, jeff suppan, erik hiljus, juan cruz, joel piniero and these two $1 acquisitons: ODALIS PEREZ AND ERIC GAGNE. i put 5 more pitchers on my reserve list since my offense wasnt gonna need any help, 4 busts and EDDIE GUARDADO.
i picked up Derrek Lee first week of the season, made an AWFUL mid-season trade.... giambi, odalis and suppan for lowe, percival and cc. (i REALLY thought odalis was gonna tank 2nd half) i didnt need giambis stats except ba. i wanted another closer to lock up saves. it didnt kill me, but it didnt help me, and i couldve gotten more for giambi.
i won HR, RBI, R, SB all pretty easily.
i finished 5th in batting average for 46 out of 50 offfensive points
i won SAVES. i actually finished 3rd in Ks and 4th in WHIP.
but my WINS and ERA were both awful. and i only got 30 pitching points.
because the bad teams in my league were awful, the team with the best pitching managed to finish right behind me in every hitting category and beat me 84 to 76. (i finished 2nd)
so to make this long answer short... you CAN win without drafting pithching. but you better be able to trust your ace 100% and you have to find at least THREE <$5 star pitchers. which isn't easy.
(the year before i wont the league with a 80 pitching staff that included maddux and schilling and $4 mulder and $1 sabathia)