Standing in friendly caltrops (dropped by yourself or anyone in your faction) makes you completely immune to all siege weapons, including firepots. Is this intended?
No its just another bug in this game. This game has so many 'cheat' bugs that you could full two pages worth. They have months worth of bugs to fix. Its why the console versions are delayed 6 months. On those platforms it costs ESO a lot of money each time they release a patch. So they have 6 months of bugs releases just to fix the outstanding bugs from beta, let alone the new bugs.
Even if they fix caltrops - and i hope this happend soon, fully researched Siege Weapon Shield protect you from 90% of damage (including pots cos they are siege weapon too)
Siege Shield is Defensively Over powerd, not in a abuseive way but the damage you otherwise would recieve is reduced by 90% with the shield around you.
There are 10 kinds of people in the world: Those who understand binary and those who don't
This reminds me of the bad old days of DAoC, which shouldn't be surprising since the same guys who did RvR there are doing AvA here. PVP in ESO, not on my list of things to try...