I kind of agree with the "high cost, low value" sentiment in regards to mongoose's version of battle dress.
A protection value of 18, while formidable, seems far too low for the traditional notion of battle dress.
I did a sample roll representing firing and entire clip from a gauss rifle using the figures from the core book. That's an 80-round magazine, so 20 bursts of 4 rounds each.
Half of the bursts rolled penetrating damage, and not inconsiderable amounts. It totals to about 36 points. I'll stipulate this may not reflect actual in-use behavior.
TNE's standard gauss rifle even has a penetration rating, and TL12 battle dress is still basically impervious to it and other small arms as listed in the TNE core book. It's a fraction of the price too, with the TL14 suit clocking in at 214kcr
To me, this reinforces the idea that battle dress is more of a *vehicle* than a measure of personal protection and infantry enhancement. This is a notion that GT got across quite well. Of course, PC's should be able to put up a fight against battle dress through creativity and quick thinking, but I don't think it's reasonable that your average player should be able to point a fairly standard infantry rifle at the thing and punch through it roughly half the time.
I just got the vehicle handbook today, and it looks like the battle dress generation rules make for suits closer to what would be expected (except for the pricing), since it appears to list numbers close to the core book as the "ultra light chassis".
In TNE, battle dress was always described (by the GM) as something fairly large and bulky, akin to a large gorilla. You wouldn't tromp around ship corridors with it, and drop troops were accommodated with purpose-built facilities. I don't recall battle dress-equipped boarding parties being addressed, but it's been a while. I've seen artwork supporting the idea of battle dress being something light and mobile (like iron man) and something big and hulking (like a big diving suit). I'm sure there's room for both ideas, and in fact those are both supported in supplement 5-6.