The biggest two problems (for me) were
1. Conquest would always end up with both sides rushing one location on the map, and that faction that would gain that one spot would basically win every time. Not very fun when basically the game is decided in the first 2 minutes. The most fun I had on Iron Europe actually, was on siege, because it gave the attackers certain advantages like infinite respawns, so it wasn't impossible for the attackers, but they still had a great challenge. Unfortunately, you couldn't cap the final point on siege, but it was still fun.
2. Server crashes and technicalities, which is a shame because I was hopeful that after the recent update that supposedly fixed the server issues, more people would play. Unfortunately, I haven't been able to actually see if it worked or not.
I don't really think there was anything else. Everything else was pretty solid. Just these things were so major that everything else suffered from it IMO.