Not the point I was attempting to make.
If you thrash someone, there could be any number of factors at play. Did your opponent make a real blunder? Did you capitalise on his every mistake? And vice versa. How were the dice?
For instance, last game of X-Wing I played, I couldn't hit nor evade for toffee. My opponents dice? The exact opposite.
What's your average win rate against that particular opponent? Example - my Dark Elves are normally pretty damned good, and I'm pretty damned good. Except against Monica's bloody Wood Elves that I have never, ever beat. Ever. Does that make Wood Elves unbalanced against Dark Elves? Nope, I just cannot beat Monica. Come damn close at times, but still choked in the end.
My point is that many games which turn out one sided are quickly blamed on game balance by the losing side. Worst expression I hear? 'You diced me'....that's right, it had nothing to do with organising flank charges at either side of your line, and your decision not to break your line, resulting in me rolling straight up both flanks and having the game all my own way. Oh no. I must have diced you. It's the only possible explanation.
In order to give anything even vaguely subjective, we need much more information. What did the Nids field? Anyone's rolling obscenely above average? Was their much terrain? What was the mission?
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The internet just ate my long and detailed reply.
Short and simple: Lots of MCs, Lots of psykers, lots of cover, big squad of genestealers outflanking. Weak right flank, which I exploited by drawing him out then deepstriking most of my force on his now exposed left flank. Most of his heavy hitters were fried by melta/missile/pulse laser before they could do anything.
If you exploited the flank and played to your strengths, I don't think it's the Eldar Codex that's at fault
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if you both enjoyed the game, whats the problem? If you didn't because it was too easy for you, make some changes or suggest some for the opponent. Or write some custome missions, eldar covering an evacuation of an exodite world being overrun with swarms of nids or capturing a certain Synapse creature for use in forcing the hive fleet off course away from the path of a craftworld, into a sector of the Imperium. The missions in the book are a great starting point, but there are hundreds of other missions out there now rather than the 12 in the main rule book.