Back when I played WoW (pre any expansion) I mained a Shaman. However, instead of using the Shaman set for level 60s, I used the Hunter set. I got harassed to no end for this, especially by my own guild. At the time 90%+ of the Shaman were restore spec'ed, and while I was to some degree (enough to sustain myself) I was spec'ed mainly to deal massive amounts of burst damage.
This lead to a conflict with my guild during an UBRS(iirc) run; they said they were tired of healing me and I need to respec for healing. I told them I have one of the highest DPSes in guild, that I can out damage rogues in most cases, and that I don't need to be healed as I could take care of myself. Needless to say they stopped healing me.
Because of the arguing and whatnot our group wiped on one of the bosses. I reincarnated, left my teammates dead, finished the boss off single handedly and stole all the loot. Obviously I got booted out of the guild for this.
Being angry at me, whenever I encountered a former guildmate they challenged me to a dual, and found out what my build was made for. Shortly after the honor system was implemented (but before battlegrounds) I started ganking even more than I previously had (which was a lot) and it was a blast. Then battlegrounds was implemented, world PVP died, and Shaman were pretty much forced to be half-assed healers in PVP amidst the chaos. It wasn't long before I gave up on WoW.
A similar thing happened during my 2moons run. I was the highest level Segnale(healer) on the server (for quite some time), but unlike every single other Segnale on the server which were entirely health spec'ed and equiped with lvl 6 weapons, I was pure damage spec'ed wielding the most powerful weapon for my level.
By all means I was a glass cannon, but very few could survive long enough to attack me. I was one of the most notorious PVPers, griefers, and guild leaders on the server. I hunted down mods/GMs, despite their level advantage, just because I could. Regardless, I came under constant fire for not being spec'ed for party grinding.
Kind of went on a tangent, but the point I'm making is there is a small degree of flexibility with builds in these sort of games: many of which are only effective if they are done to extremes, making huge sacrifices in various areas of gameplay. The people who do chose to go these routes, constantly get shit for not following a cookie cutter build. So not only does the game itself vastly limit your options, but the community treats you like a leper if you do anything other than the norm -- regardless of the success you have with your build.
This is one of the reasons I can't do MMOs anymore. Moreover I can't stand the fact that every MMO allows respec'ing; it makes your choices meaningless and encourages this sort of bullying into playing a defined role.
Fingers Diablo III will not allow respec. (yes I know its not an MMO)