My main character is a level 30 Wood Elf in AD but I decided to check out the other alliances to explore new areas, so created 2 similar Wood Elf characters to do so. Ebonheart was ok but I couldn't see many other players around in the starting area. The town also felt 'smaller' than the other two, but maybe that's just me :P It felt a little lonely after a while and I didn't feel a group vibe from it. Again, this was just what I witnessed at that time. Daggerfall gave me the worst experience. I was sadly harassed pretty much straight away, followed around (not in a good way), sent nagging messages and friend requests, people mimicking sex noises over the mic... I played for as long as I could before logging off and heading back to AD where I immediately played a lute with another player as people danced! :P
Please remember these are only my experiences and not necessarily the norm. I just wondered what other people have experienced and hopefully reassure me that this isn't just an 'Alliance' thing. Maybe I was just unlucky?