One of the problems I have with Denise Crosby portraying a Head of Security is that she would have had to have come up through security presumably (although Worf didn't), Tasha just doesn't physically look the part. Think about imagines of female marines and female police officers that you have seen, now think of Tasha. the two imagines don't exactly line up do they? Yes, I know that the majority of her fighting would have been with energy weapons of some kind, but you think the girl would be packing some muscle too.
still she looked more suited to the role than Marina Sirtis. Who originally auditiond for the part.
She's a good actor it's a shame she didnt get more to do. Woopi Goldberg definately took over her role giving all the best advice.
I thought Denise Crosby did a good job with her role in Yesterday's Enterprise.