What follows is a test game run using Fattdex's 30k Legion V0.5 list against a guard tank legion. The intent was to test the effectiveness of the legion lists against something other than other legion forces to get a measure of the effect of the legion marines not having ATSKNF or something similar.
This isn't a great read, i haven't the time to write up a cool report but at least there a few pics and an action by action list of events.
Deployment shots:


Turn 1
Marines win initiative
SM -Basilisk sustain on Mech inf Coy and clip death strikes. Mech inf loose 2 chimera and 1 Inf. Death strikes loose 1 & break.
IG – advance super heavy tanks, nothing in range
SM – doubles tactical 2 fwd to ruins, no shooting.
IG – advance 2nd tank coy, move onto road.
SM – tac 1 doubles, no shooting.
IG – advance warhounds, nil shooting.
SM – javelins advance, fire on warhounds, 1 hit.
IG – 1st tank coy double, fire on Cerberus, 1 BM
SM – Cerberus advance, fire on 1st tank coy, 1 kill.
IG – mech inf advance to bunkers
SM – single warhound advances to fire on IG warhounds. No hits.

IG – Marauder ground attack on tac 1, lots of hits, lots of saves, 1 rhino killed.
SM – Landraiders double, fire on baneblades, 4 hits, all save.

SM – fell blades double, 1 hit which takes last shield.
Rally phase:
SM rallies Tac 1 & Cerberus.
IG baneblades, Mech inf, deathstrike & titans rally. 1st tank coy fail.
Turn 2.
Marines win initiative.

SM – Javlins sustain, 4 hits on warhounds, which strips all shields.
SM – Fellblades retain and sustain on warhounds, 5 DC damage, killing one and reducing the other to a single DC, it breaks but no retreat made.
IG – Baneblades advance. Fire on landraiders, 3 hits and all save.
SM – Cerberus advance on 1st tank coy, 4 hits no kills.
IG – 1st tank coy advance, fire on LR, 15 hits, 5 kills, broken, retreat to blitz.
SM – basilisk sustain fire on tank coy, 5 hits, all save.
IG – 2nd tank coy, fire on basilisks, 4 in range, 4 hits, 2 KIA, broken, hide near own blitz.
SM – Warhounds advance, fire on tank coy 2, 2 hits, 2 kills.
IG – Mech inf sustain on warhound, 1 hit, 1 shield gone.
SM - advance tac 1, contest obj.
IG – deathstrikes sustain and target warhound, killed twice over!.

SM – engage with bikes on tank coy 1. SM score 4 + 3 from supporting hits, IG score 7 hits. Kills 3 bike & 1 demolisher, SM lost 10 V 9. Bikes flee to deep in IG half.
IG – Marauders ground attack on fellblades, 4 hits, all save. (take a BM on exit)
SM – double with tac 2, close on tank coy 2.
Rally phase.
SM use reroll for LR to rally, basilisk rally, fellblades, bikes rally,
IG: warhound rallies (2BM & 1 shield), tank coy 2 rally, mech inf coy rally, tank coy 1 rally.
Turn 3
SM win initiative.
SM – tac 1 & 2 combined assault on tank coy 2, all marines make CC. SM cause 10 normal hits and 2MW causing 5 kills, IG got 3 hits for 2 kills, 3 hits from IG spt killing 2 more. Result is 13 v 9 to SM. Wipeout from resolution.
SM – retain, Cerberus sustain on tank coy 1. 3 normal and 3 MW hits, 5 kills. 6 BM, 1 from breaking.

IG – warhound advances, fires on tac 1, 2 kills.
SM – Basilisk sustain on baneblades, 3 hits, 2 DC.
IG – double with 1st tank coy, shoot on landraiders near blitz and break from single BM.
SM – double with speeders, take out last deathstrike IVO blitz.
IG – baneblades advance, shoot tac 1 killing 2 infantry and rhino, broken and move to IG blitz, whilst moving around mech inf.
IG – Sustain, mech inf coy shot tac 2. 1 rhino KIA.
SM – double with fellblades to fire on baneblades, 1 DC damage, now on 5BM.
IG – Marauder ground attack on tac 2, killing 1 rhino.
SM – bike march to blitz.
Rally:
SM all rally, IG rally bar baneblades and warhound.

Victory conditions
SM: T&H, Blitz.
IG: Nil

Whilst the marines did break easily, which didn't feel right, the game failed to prove our thoughts that the marine formations were too fragile without ATSKNF but our IG player is rather new to the game and failed to exploit the broken formations and also probably let the marine assault squads get too close on the tanks.
The fellblades were really effective and added some much needed range and hitting power to the Legion list. The cerberus were also quite good, especially once they could advance or sustain on targets in range.
Its certainly a change to play with the legion list, especially if you're used to using tacticals and arty for shooting up enemy units pre assault..
We had another game last night where I took a heavy infantry legion list, lacking arty and air against a similar IG list and got owned big time. The loss of ATSKNF is felt a lot more on the larger infantry formations than it is on the smaller armour formations. Hopefully CAL will post this game up shortly.