I played against EW in GW2 (iirc) about 2 months ago. We were surprised and asked them. Apparently only one of their team members was part of the old guild from back in the days. I'm not sure if they are still playing by now.
I'm not playing in NA but i would love to see all your t1 servers fully stacked. That would probably be the best solution for all this. Then it's truly about skill and tactics instead of timezones issues and other excuses. But with paid transfers in and most hardcore EU guilds favouring GvG action, i doubt that this will happen.
But who knows. Maybe some day.
I can totally understand that the t2 servers want to keep their community and just try to enter t1 themselves tho.
Well, a warrior lacks condi removal so you want to build for that. I use Shrug it off and the warhorn (traited). Gear wise, you need enough toughness. So knight works best imo. But some people prefer p/v/t for more vitality. It also depends on how much damage you want to do of course.
The hammer is awesome. My favourite WvW weapon for sure. But we will be immobilized, crippled etc. and killed if we don't position ourselves extremely well. So you NEED mobility. In the other weaponset, i recommend sword mainhand (trait -> mobile strikes -> good escapes!). Now, i alrdy said that i prefer warhorn in the off-hand for more condi removal and team support but shield and axe are also good options. I haven't played too much with mace off-hand outside of sPvP so i'm not sure how viable it is in WvW.
Lastly, run more shouts and trait into tactics for boon duration and healing shouts. Depending on jewelery, you will still be able to hit decently. But it really depends on what you want. As for runes, i suggest boon duration ones but soldier runes work as well.
I know i kinda say what i'm using but the point is that you need to counter what enemies throw at you while still being able to be effective. So you need toughness, condi removal and mobility to get out. The only reason you will die, is because you get immobilized/stunned and focused. You want to prevent that. So you use the sword leap to get back to your allies. Heal up and get ready to wreck havoc again.
I also use a stability skill when running with my guild because it's one of the best boons in the game. It allows you to freely do whatever you want. While snaring the enemy team at the same time, you pretty much win every time (unless they use stability as well ofc). In zergs, it's less organised anyways so you probably want to use endure pain.
edit: This is a video i made like a month ago. We (some guildies and some randoms) against some random zergs and guilds. I'll link the part where you can see this build being very effective. I just keep moving, getting out of harm while controlling the enemies. They can't escape and i even used sword cripples (maybe not in vid) to keep the enemies snared (traited to immobilize). The thing is, i know that i have a zerg behind me. I know my snared enemies will die. My damage won't be high but i was extremely effective in the fight and i don't die easily. Here you go: