my guild tried a t6 raid last week. took 5 days.
we beat a t5 in less than a day but WOW t6 was like 5xs harder. I only have 4 t7 characters. I don't try to put together a "special" team. I have my 5 first team with the four t7s at lvls 80, 79,79,79 and a t6 QG lvl 78.
after those 5, I pretty much spread thing to the rest of my whole team, half are above lvl70. the rest in the mid 50s - mid 60s. I win GW a little more than half the time. depends on if they pump the last 2 nodes with full lvl 80 squads or not, and it's random.
point is, I am a bit above average player. but I have hit a wall with Gear. everyone needs the same things and the drops are few and far between.
and I know MODs are supposed to help compensate for that but upgrading MODs is 20xs more expensive than Gear, unless you count how much energy must be spent to aquire such gear.
I spent 138 energy to get ONE mk 1 bactin gel just yesterday, and I have 4 people who each need 5 each, amd dont get me started on the slow drop of MK III Sienar Holo Projectors.
they just need to make gear a little more accessible now that they have added the expensive to lvl up MODs.