I'm right with you there...If you are always in a group of 20, then I'd go DPS all the way, but if you are in the 8-12 groups and your team will get knocked out, I'm going to stick all my tanks at the end...Including my 3100 Blisseys....
I finally Charge TMed my Dragon Pulse Lapras to Ice Beam...Since my Lapras were both maxed out from the old Gym days before Lapras got nerfed, they should be solid against Lugia.
I also have a 95% Arcanine with FF/WC that I plan to bring to any Articuno Raid...as well as my maxed Vaporeon for neutral damage, but take NVE damage back...as well as a Snorlax with L/HS.
Feels bad when you're the Lvl 37+ player among a sea of Level 20s and you get 0 balls for damage and 0 for team simply due to you being knocked out...and rejoining...