Quartey's best weight was 147 not 154 and I think he was a bit small at Jr Middleweight. But still Quartey had some quality performances at 154 beating Vernon Phillips. And he should've got the nod vs Vernon Forrest but was robbed. Quartey even at 154 would stop Tszyu in 7-8 rounds IMO.
Quartey wasn't 3-3 at Jr Middleweight he was 3-2 the fight vs Wright was at Middleweight. And really Quartey should've had only 1 loss at Jr Middleweight the loss to Forrest is widely regarded as a bad decision.