I got a pack howitzer awhile back and i really loved it~The lieg has similar problems, but the lieg can be set up next to a flak or medic base, making them very hard to harass or counter barrage. Not to mention a gun shield to defend it. The pack comes in a tier with 0 suppression units making it really hard to actually defend it. Especially since it's autofire is even lower then the lieg as well, forcing it closer.
I used it the same way i use the OKW Leig gun
Neither is something i'd use to counter a mortar but it is something i'd use to target an attacking blob of soldiers to kill some models and slow them down so i can react to it better (with the supperession thing it has of course)
Actually... I'd target mortars or team weapons once it unlocked it's white phosphorus barrage ability....
Meh, that's just me.... I hve loads of fun with the suppressing artillery the WFA has ^^~
The lieg works with the OKW playstle while the pack works against USF. Also OKW can always just get a stuka. M8 just does more of the same.