I also didn't like Manila during S3, and didn't care for her too much in AS1.
But I think in her defence, the two worst components of the Heather clique were Delta and - regrettably - Raja. They were certainly the two meanest and petty of the four - constantly attacking Stacy and Shangela, saying they didn't deserve to be there, etc. - whilst Carmen was a bit childish and Manila seemed to have a good rapport with Yarlexis and was also a little immature rather than mean. I didn't much like her because she bombed quite a lot and only really excelled at the design challenges (I still don't understand how she won the News challenge for a racist stereotype
Delta or Shangela should've won that.) but I think the whole season was just a really draining experience and as such I might look back on too many of the queens a little harshly. Carmen's proved herself to be a spiteful bore, and Delta is a vaguebooking ball of drama, post-show and I think that's probably still tainting the Heathers reputation. At least Raja and Manila have grown up.