Last build 30/15 (4 IF, 10 PS, 5 ATH/SHD/WM). I was wearing medium armor (15 weight) and was using Knightly Heater and European Cav Sword. It is very decent build, but be prepared to get spammed by "ninjas" (retards with 12/36 build and Katana/Miaodao bullshit swords). It is surprisingly good against heavily armored STR builds. Tried Military Cleaver, it sucks with this build. Too short. Sideways shield coverage is piss poor, so better to go with round shields.
Current build 18/24 (5 IF, 6 PS, 8 ATH/SHD/WM). Was using same gear but switched to light armor (6 weight) and combination of Broad Short Sword and Buckler. My kills dwindled to half/third of what I was doing with previous build but survivability increased (dat S key yo). Swings are useless, stab is potent but I miss way more than I hit (go with Espada imho). Sideways shield coverage is decent despite the fact I'm using buckler (8 shield skill is great).
Bottom line is, first build is better and 5 ATH is more than enough for siege imho. Decent for battle also. Crazy "ninja" builds will piss you off though, be prepared. They'll pound your shield, trying to get between the shield and your char model to get a "dirty" hit. Especially those with 50 ping or more, which is basically 50% of current EU community.
Wouldn't recommend doing a shield build, mainly because of server issues. Better go with retard ninja build. but don't go with spammy 2H weapons, pick some long and thin polearm like MW Svaerdstav. Aim for legs and s key while you are doing it. Great success!
Or go full ultramarine, with a long ass sword (Flamberge is great, but expensive). Cookie cutter builds like 27/18, 30/15 or 33/12 will do (go full IF). That will be the best possible melee build when new patch hit the shelves.