1.8 May add a lot of cool new features and a different style of pvp but most players prefer 1.7 pvp over 1.8. Now don't say people like myself, who prefer 1.7 ignorant because we choose to prefer that version of pvp over 1.8. I see many things wrong with 1.8 because it was rushed towards the end. I simply think 1.7 is better for pvp. It's not that I don't "accept change" or "accept the fact that change is better" it's because I like being able to have fair fights. Lots almost impossible to do a fair fight anymore. Hackers may have decreased overall but they've become much harder to kill. I would like to see a comparison on 1.7 pvp and 1.8. Now, not trying to compare or anything but MCG is the only 1.8 only server that's "big." Meaning, Hive, Hypixel, Mineplex and many more both support 1.7 and 1.8.
Now, MCG is great and all but they do have lots of flaws. I would like to point out that Hive and Hypixel, both insanely popular servers just like MCG run both versions but they both run way more mini games. Now tell me this, why is it 2.5x more work? I highly doubt that. Hive and Hypixel run tons of plugins both compatible with 1.7 and 1.8.
I can't put more here cause I'm currently out but I'll give more detailed reasons and explain more of what I think when I can.
FYI: this is my opinion and I know little kids are going to flip over what I've said, so I have one word for you all.
Chill.