Completely agree with what Larsen mentions, the facade that the guild is ambitious to raid asap is nothing more than a terrible lie. The core guild officers and veterans are nothing more than casuals whom are wasting eager players time when being promised a guild whom share the same ambitions to clear content, where in reality its simply a casual guild.
Furthermore, you speak of maturity, whereas when i left my reasons for leaving the guild in regards to a lack of set goals and enthusiasm to get to end game as soon as possible, you go ahead and delete my leaving post within an hour of posting it.
However i suppose at least Raid is Dead was a great catalyst that enabled me to make great friends that i know today, who funnily enough also chose to leave the guild.