Our playgroup has found great success with mass Scout armies accompanied with a Warlord Titan.
They use this common base:
- 8 Scout Detachments, 2 with a Captain.
- 1 Warlord Titan
- 1 Thunderbolt Squadron
2300 pts.
Then there are variations, but I have lately gone with:
- 2 Vindicator detachments, both with a Hunter
- 4 Razorback upgrades
Another successful spin has been:
- 1 Devastator with Hunter and razorback
- 1 Terminators
and, tbh anything you want, as long as there are at least 12 activations.
The deployment is very versatile, as 8 activations can be deployed as garrison and the Warlord can be screened.
It plays out by activating scouts all along turn 1, for optimal positions to execute 2-3 (combined) assaults on turn 2, while usually doubling with the Warlord. The scouts can alternatively just activate and place a BM if the enemy formations are too tough to assault (8 BMs breaks a lot of things).
If the opponent focuses the scouts, he has to shoot tons to actually hurt more than 3 formations, due to the ATSKNF, cover and base save. If he focuses the Warlord, Regroup is your friend.
All of that is relatively harmless (

), except the army is remarkably able to recover from breaking due to high Marine initiative, and usually gets into position to contest/control all the objectives in the map. Combined with the Warlord breaking 1 formation/turn (most of the time) and sometimes even supporting scout assaults, and being a very hard BTS, it has proven a very effective army.
This list configuration has proven remarkably successful in different hands, winning 7 out 9 games to date, which is not our usual statistics with marines. It has definitely affected our local metagame.
It also is remarkably resilient to counters, due to the fact that scouts and the Warlord require vastly different solutions to handle.
We have not tried it at 2k points with a Reaver, but it might be even more effective.
If anything, this has confirmed to us the potency of SM scouts, which are pretty much eclipsing the need for other SM units.
Any thoughts on this are welcome, especially if you can find easy counters

.