Does sound like a run of bad luck. As what was previously said...a small balanced team can whizz thru this TF in 90 mins or less with no deaths. No more than 5 members in the team...any more increases mob size. A good mix of ATs to speed thru this with min deaths would include;
A FF defender or a controller with FF as a secondary. (makes it a cake walk)
An Empath def or controller with emp secondary. (makes the cake walk that much easier)
A tank or scrap that can hold aggro...or a controller with good holds. (I've done this with and without a tank...nice to have but not totally necessary)
2 damage dealers...scrappers or blasters.
*important - everyone should be the same level or at min +/- 1 levels from each other
Also...having someone with stealth and recall friend helps in the first mission immensly.
I've done this TF with SG mates and pick-ups over a dozen times with no deaths...its good xp and always fun.