Hey!
Personally I wouldn't call the current meta defensive, I feel it's more about timing, teamplay and the place where you want to fight.
As an example whenever flags spawn, most of the time, AE lets the other team get on the flag first, because if we then engage in a wider circle (I guess there's a very small comparisaon to roach concaves in SCII) it spreads them thin, it also puts their archers in fixed positions trying to cover the flags, while ours can move around in order too whichever is at that point required.
Honestly I feel it's about opportunities, AE's play on Sandi's is basicly Graveyard or we go for a timed push on it. Why? Simply because it's the best place in the map to fight. Wouldn't make allot of sense to go fight in the open and run into the enemy at that point in time does not give us an advantage.
Now I wouldn't say this play is defensive and does not takes risks at all. It's about getting a superior position from which we'll then happily engage.
As an example I'll give a match we had with RNGD (another really good EU team). We had a right side push strat on ruins, but they had prepared for it, and thus counterd it perfectly. Our strat was based around taking a good position for two of the flags while forcing the enemy into an akward position in which they had to retreat or being crushed from our push.
It was a high risk strat, because we tried it for 4 rounds, and every round we got countered by RNGD. Although the strat seemed defensive, it was more high-risk high-reward sort of thing.
Last I'd like to say that you play Warband the way you want, whether you go naked GS and smash people up or you only take boots and gloves or whatever the **** you do, it's a game it's the way you (being one individual or a team) enjoy it.
I must admit when WNL began and people where very aggresive and sometimes even a bit cheesy I was pleasantly surprised, it could be another layer to Warband, do you go for an aggresive attack and try to punish the enemy for a split as fast as possible, or do you more go for positioning and timing, and how do does two pan out? Unfortunatly people stopped playing ubar agressive and very tactical at the same time.
TL;DR
Who gives a **** about "the meta", the game is too small and the limit has not been reached, there is not yet a best way to play the game.
Play the game the way you want it.