Awwwhh, Where do I begin? I think all previous comments have summarized the most important limitations containing 1.8, however I would like to thoroughly brief you all why this would majorly impact the server negatively.
Let's begin with the fact that the update from 1.7-1.8 in general minecraft did in fact change or adjust focal mechanics surrounding pvp, but for some particular people with decent computers it is quite the FPS boost. Unfortunately for others it has ultimately decreased their performance leading to terrible lag thus them players won't be able to play anymore full stop. Therefore their overall pvp experience on THIS SERVER has come to an end.
How does this affect the server negatively? Well there is no doubt that the 'Survival Games' or in general the PvP Game Modes MCGamer has to offer is their prominent source to server population growth, and as a personal opinion and in behalf of majority I really can't see this update being a positive improvement. It is committing and admirable of some of you to suggest "adapting", but that still doesn't improve the server's PvP benefits. I understand after this transformation from sole hunger games to an official server providing a VARIETY of different mini-games was 'a look in to the future' but I think a lot of you need to flashback and realize was popularized this server in the first place. I am most definitely not proclaiming the END OF MCSG! I just feel this update will decrease the server's popularity quite significantly due to the new and terrible mechanics of 1.8. Because many people hated the transition from MCGamer v1 to v2 however it didn't necessarily change any PvP 'setttings'.
Again I am not the one to decide this, however I have only trying to persuade you all this transition MAY be a detrimental mistake!