I've gotten a few MDR's. Run Lexington and Hudson refugee camp on challenging in a team (might work solo but can't confirm). Exotics, outside of legendary mission only drop from bosses, none drop from mission completions. Larae will drop BBV, showstopper or MDR.
I've my fair share of showstoppers and chest pieces from her but no MDR. I don't really run Lex much at all anymore, it burnt me out when the BBV was much harder to get than it is now and I ran Lex around 200 times until it finally dropped.
As far as overall usage goes...
1 - Assault
2 - Hybrid Tactician
3 - Striker
4 - Hybrid Reclaimer
5 - Support Tactician
6 - D3-FNC
Edit: Yeah, the MDR is my new white whale.
Nice builds Mythic and axb2013.
I've got what I think the norm is for the high end/exotic build: Barrets, Specialised, Tenacious, Skull gloves, Short bows, Nimble, all specced to firearms with 1 stamina to unlock weapon talents, all firearms+health gear mods, using MP7 with responsive, deadly, unforgiving, 44% crit chance prior to pulse, 121% crit damage.
I have 2 DeadEye builds, both identical except for primary, 1 with SVD and 1 with M700 depending on what I'm playing.
Turretician, so everything specced into electronics using Active sensor mod on the turret, LWM4 with talented, competent and responsive (third slot so requirements N/A).
Its quite a fun PVE and PVP build as the turret is that strong at just over 600k skill power it's like having 2 people shoot down the enemy. Use inventive backpack on this for the extra skill power at full health.
Toughness wise all the builds are under 300k except for the DeadEye as I had to roll marksmen damage so stuck with stamina on them until I get some new gloves. Only place I spec for toughness now is sometimes on the gear depending on the build but health sometimes comes under the same as crit damage or skill power so build dependant I'll take the crit or skill power.
Only have an image of the deadeye build to hand:
Obviosuly in LS the stats get abit more inflated.
While I was going through the capture gallery I came across these so thought I'd share. My current best Last Stand score using the High End/Exotic build (nades are so OP tbh).
And there will never be a better moment than 1 shotting the Hunters
(Think the pics should be working correctly now)