I've only been playing a month but I've done my homework and played a lot with these. As of yet I do not have any full classy sets and because I'm new one thing I've noticed is all you "old timers" don't have any beginners builds as it were.
So I figured I'd share this. It's one of my 6-combo builds that all revolve around non-classified pieces and a NINJABIKE. (Note: if you don't have a Ninja yet just substitute a 4th piece in the backpack spot until you do).
Obviously this is the RECLAIMER (the other ones I run are D3, Tact, Sentry, Flame, and Bleed)So the stats speak for themselves but the fun I've found to playing this is 2-fold.
1) Coolheaded screams SP...but as a REC/TAC combo the idea here is not damage but simply putting as many rounds into an opponents head as quickly and accurately as possibly. Devil/Heel are pretty sweet for this with the dual bonuses, extended mags and weapon swap you're looking at 66-rounds with mirror imaged MMR's. The extra Stability, Accuracy and reload really pay off and the 60m range keeps you out of the fray...
2) Reclaimers have 1-job...keep everyone else alive. You'll know when you have one in your group and you'll know when they go down. The dual MMRs here help you keep your distance and combined with a maxed range Support Station at 12m means you can throw it out in front of you (while behind cover) and happily pick off targets. 4pc-Reclaimer obviously won't have ammo problems, and proc'ing Coolheaded means you can start spamming Defib. 50% heal with additional 50% over 10-seconds means you'll be ready to fire off every 16-seconds. The other thing I have found (and I have run many Legendary and Incursions) is that between the Box and Defib...I don't typically need Recovery Link...I mean if everyone else has gone down but me I've already screwed up and it's a $#! show. So instead I use Tack-Link...and every time it's ready I fire it off...to be honest I would say that has saved my group more often from a Hunter wipe then if I had Recovery. Plus the rare times that wipes do happen it is almost always because we start cruising along and get too spread out or someone pops up behind me and I go down first...immediately followed by the rest of them wondering why everything suddenly hurts so much more. So they all have Recovery-Link for me LOL.
Also you'll notice this build is not optimized to perfection and that's because as I mentioned in the beginning I'm a newb of sorts without classy sets. So my NINJABIKE gets used between 6 different builds...my weapons got recalibrated and optimized and equally shared between builds where ever possible. Same with several gear pieces...Tact-gear gets used between my Reclaimer, Firecrest and Tactician loadouts (same with Strikers and Barrett's in others), and that way I can optimize a few pieces and get the best bang for the buck until I get something classy.
And lastly this build has a lot of flexibility in that I ran a AR / SMG (later on Warlord / MDR) for the longest time...it's easy to flip one piece to STA if you want a talent like Ferocious, and it doesn't lose much of it's functionality. If things are getting hairy swap 'on the move' for 'battle buddy' and/or 'Tack' for 'Recovery', conversely when you have a bit more time and easier go of things flip 'Defib' with 'Overdose'.
Anyway hope someone finds this useful and would love to hear any feedback!