The timing on todays patch was very poorly planned to say the least. I understand the desire to get patches out and into the community but, to take down the servers for a patch involving guild wars with only 15 minutes left in the current guild war and then have it unavailable showed a lack of understanding for your game events and how the community plays the game based on the timings and events you have created.
The last half hour of Guild War is used making changes and updates to the next guild war line up for the guild, completing last attacks and using extra attacks in a way that can change a guild war completely by earning the room clearing points, updating and setting individual player line ups for their heros and doing hero upgrades and badges so that the player line ups for guild wars are correct.
In short you have probably affected the outcome for 2 different guild wars for some guilds by the timing of the patch. Guild wars are competative events and doing something that so radically can effect the results of the current and the next battle based on the timing of your maintenance is upsetting and frankly shows a surprising ignorance of what goes on in your own game during the last hour or so of guild war.
This would be similar to shutting down for maintanence during the last 45 minutes of a surge or a server wide event. Please do better at considering the effect of your timing on the scheduled game events and what goes on during those times, as of right now I question if the people at the top making decisions give any thought to player exerience and the results of the actions and the timing on when things happen.