Being agi build with no backup on EU1 server looks like this:
1) spawn
2) since you're faster than almost everyone else you are among the first people to spot an enemy
3) get shot by either Agor (70% of your HP gone) or some random arrow (30% gone)
4) get couched by some mighty fine GK player who managed to come behind our whole team before most of us spawned
5) get in fight with one or two guys, hit them couple of times (they are STR heavy builds fully loomed) just to be stabbed from behind by their buddy pikemen which usually results in death
6) get into brawl with your comrades just to be hit by some friendly STR build who likes to kill his enemies by spamming blindly
7) get into fight just to be shot by friendly archer (if it's Zerobot1 it's usually friendly headshot which means death)
8) overwhelmed by enemy players (some smelly clan with 8 of them going after you, half having pikes) you decide to ru...retreat and then some mighty fine GK player spots you, you avoid his lance/couched lance but next time he just run over you which leaves you unprotected and those 8 fine clansmen have just arrived...
Agi builds are fun, if you wait till STR builds kill each other, cav numbers go down to reasonable levels and archers forget about you so you can ninja backstab them from behind.
For crowd fighting and teamplay heavy STR builds are always better.