I've recently played a few more games against IW 2.0a and the list is coming along really well.
Ordinatus Medrendgard - Much improved. The drop in BP so that it automatically places 2 instead of 3 BM and the accompanying cost decrease mean it remains a fantastic unit but can't simply break portions of the opponent's army before even rolling dice. It means a more enjoyable game, and hopefully the price break means it remains a good choice for the IW player.
Defilers as core are an outstanding unit, shooting like a leman russ and then using EA+1 macroweapons in assault makes an impressive combination. They are so versatile it might even be worth trying a list that pushes them near their limit. For an example off the top of my head, something as simple as this might be extremely viable:
HAVOC COMPANY [450]
4 Havocs and 2 Land Raiders, Stalker, Daemon Prince (Supreme Commander)
DEFILER ASSAULT PACK [275] 4 Defilers
DEFILER ASSAULT PACK [275] 4 Defilers
DEFILER ASSAULT PACK [275] 4 Defilers
DEFILER ASSAULT PACK [275] 4 Defilers
DEFILER ASSAULT PACK [275] 4 Defilers
DEFILER ASSAULT PACK [275] 4 Defilers
DEFILER ASSAULT PACK [275] 4 Defilers
DEFILER ASSAULT PACK [275] 4 Defilers
CHOSEN [125] 4 Chaos Space Marine Scouts
HELLBLADE FLIGHT [200] 3 Fighters
(Guide for the casual reader:
Defiler: Fearless, Infiltrator, Inv Save, Walker
AV 20cm Armour 4+ CC 4+ FF 3+
[] Battle Cannon 30cm 75cm AP4+/AT4+
[] Reaper Autocannon AP4+/AT6+
[] Twin Heavy Flamer 15cm AP3+, IC
[] Battle Claws (Contact) AW, Macroweapon, EA +1)
That could be a sleeper-hit list from this armylist. Should it be?
Obliterators - Phenomenal units. The IW list is unique in allowing them to be taken as a formation rather than an upgrade on to others. Steve is working on a battle report that shows just how much a thorn in the side of the opponent a Fearless RA unit with that much firepower can be, but the part that game didn't illustrate is their
Anti-air ability.(Guide for the casual reader:
Obliterators INF 15cm
Reinforced Armour, Thick Rear Armour, Fearless, Teleport
Armour 4+ Reinforced CC 3+ FF 2+
3x Body Weapons 45cm AP5+/AT5+/AA6+ )
They come in units of 5 for 425pts, which is expensive but actually a pretty fair price for a fantastic unit (teleport plus fearless were made for each other). The issue is that now they are allowed in a single unit rather than as an upgrade, they fire 15 Anti-air shots per formation at a range of 45cm. The 2 formations of Oblits I'd consider for my own IA would fire 30 AA 6+ shots.
It's hard to put a points value on that sort of AA, especially coming from a non-dedicated AA unit that has so many other uses, can teleport down-field to cover much of the table and is RA and Fearless. Fortunately it's not my responsibility, but I can offer two suggestions:
1) Drop the AA from Obliterators bought as Formations (ie from the IA Oblits), and compensate them with a price drop (they'd still be good at 400pts, for example).
2) De-couple the AA gun from the body weapon profile, so 3x Body Weapons 45cm AP5+/AT5+/AA6+ becomes 3x Body Weapons 45cm AP5+/AT5+ and Body Reapers 30cm AA6+, leaving the price the same but giving them 'only' 5 AA shots per formation.
These are just suggestions. Steve was asking what I'd take if using IA vs a Space Marine air assault list. In it's current incarnation, I'd probably take 2 stalkers and 2 formations of oblits in any Take-All-Comers list anyway, and if you kept the Oblits around the Ordinatus instead of teleporting forward that could get you 30 Oblit shots and 4 Stalker AA shots against the arriving thunderhawks.
(That is not a tailored-list btw, just a tailored deployment).
I hope the feedback is useful. It's a great list, IW > SM