I have decided that, seeing as the Catachan are clearly Vietnam GIs, the Cadians must be British. Also, it would make sense for GW's favourite regiments to be British, seeing as they are too.
IG will never fit in in ME... Their flashlights can rip off arms and punch through space marine armour with a lucky shot. Compare this to, say, the cannon on the Mako, that sometimes fails to kill people when shot near them. Basically, doesn't matter who's fighting them from ME, the Guard will win. By a long way. Epically.
Also, the Reapers are a joke compared to the Imperial Navy.
Well, that's why it's only a few Guardsmen that end up in ME-verse.
IN (or the "Navis Militaris" in High Gothic) vs Reapers, it's just so sad, because the smallest Imperial Navy vessel is eight hundred meters long. That's around the size of the Systems Alliance dreadnoughts.
An IN light cruiser ranges around 1.8 kilometers long, with battleships around five km in length. Note that this is a more conservative estimate; some give Imperial battleships as long as 15 kilometers!
All combined with high-triple-digit gigaton to low single-digit teraton weapons yields. It's like a single Bomber weapon would simple annihilate a Reaper. Cuz 40K verse strikecraft have kiloton-to-megaton range weapons.
Anyways, yeah, lasguns>>>>>mass accelerator doohickeys.
As an aside, my plan was initially a lone Guardsmen, later upgraded to several. These several are:
1) A Cadian Veteran Grenadier. He's got some scavenged gear, cuz that's what the veterans of most regiments do. Scavenge the battlefield for stuff they can use.
2) A (female!) Stormtrooper. Because the Glory Boys (or Girl(s)!) are awesome.
3) A Catachan sniper/demolitions expert. Cuz Catachans are awesome.
4) A Techpriest. To fix stuff, and other techpriest-ey things.
5) A COMMISSAR! Who can go, "HERESY! *BLAM*". And say that he wants people to drive him closer so he can hit them with his sword.
I also initially considered a Battle Sister, but decided that that would be too OTT. Also, as-is, only the Commissar has a weapon with limited ammunition, though the Catachan also has a slug-gun sniper rifle.
EDIT: I think the questionable lethality of the Mako's main gun in-game can be ascribed to game mechanics. Note that the ME devs have said all the Codex stuff overrides stuff in the game, be it visuals, dialogue, whatever. Codex>Game for ME analysis purposes.
Incidentally, that's similar to GW's stance; Fluff>game&game rules, as the fluff is supposed to accurately portray the setting, while the game rules are to facilitate balanced play of a game that is set within the setting.
Oh, yeah, and IN ships have all sorts of nasty DEWs that will go straight through ME kinetic barriers. Not to mention that their kinetic gunnery systems would simply be a case of "one slug has more energy contained in it than a frigate/cruiser uses in combat situations". Or something like that.
