With my second Brit account (Boba Fett, currently 8 at 2vs2 random) I have been playing almost 100 2vs2 randoms now. To get at least a half decent brits early-mid game you have to understand that IS are the worst baseline infantry in the game right now as they dont really excel at anything in the early game.
Cons:
- High pop cap (8 when upgraded)
- High reinforcement cost
- High initial cost
- Dont have dps to chase any squad on retreat or force sniper to move back
- No good vet until vet2, but even with vet2 they will still drop like flies to indirect fire, sniper etc.
- Bad dps out of cover and only decent dps while in cover
- No AT snare and Piats sucks as well against fast moving light armor
- need 120 munitions for brens just to compete with a single lmg gren
- Zero flanking abilities as their grenades sucks which also cost fuel/mp
- Cant wire, repair or plant mines like other factions starting unit
Pros:
- Good healing ability
- Scale well with vet (but bleed alot of mp before that)
- Can build green cover and trench
The bottom line is that the cons far outweight the pros, so they are not really useful for more than a support unit that you use for healing/artillery flares/building cover etc..
So Brits are left with 3 other early-mid game options for AI infantry;
1) RE spam with support (good late game synergy with churchills tanks for fast repair)
2) Commandos with support
3) Combined arms with snipers/mg etc.
With the new patch try;
+ MG, MG, UC, T2 (similar to what Braden was using in the recent Relic balance Q&A) or MG, UC, T2
From there you go with either 1, 2, 3 with your personal build preferences. Personal in 2vs2s, if I am low on mp, I wont even bother reinforcing my starting IS and use it primary for healing. The UC dont necessarily need to be upgraded against werh until you sure that it can be protected against 222s (with a sniper, AT gun, mines, Tank hunters, AC).
Imo, IS starting unit should be replaced with a RE squad and increase starting MP to compensate. Move IS to T2 and give them more specialization with the T2 hammer or Anvil upgrade.
As example, with T2 hammer > Brits get Tank Hunters with AT rifle/grenades or T2 Anvil Brits IS get a free lmg vicker and/or more defensive bonus.
Couldn't sum it up better