Ok, let me just tell you why you are wrong (except for the fact that you haven't mentioned the fact that PvP is now terrible quality). The new spectator gamemode is a BAD THING! The problem with it is that it means that:
1. People can go through blocks to find map secrets
2. You can't try a parkour in this gamemode
To continue... The actual PvP is terrible. If people think that 1.7 was all about ping, then 1.8 is literally only ping. The new hit-for-hit thing in 1.8 doesn't mean that everyone gets equal hits (although that would be stupid anyway), it means that people with better ping will get all the hits, and the other can watch and die. Also, you can hardly get any hits in a few seconds unless you have negative ping, so taking out teams, or simply overly stacked players is impossible.
Next, the amount of hackers has decreased, admittedly, but the new hacks are way more overpowered than those of 1.7 hackers. Killing hackers was no big deal in 1.7, now the hackers have around 7 blocks reach, and even hitting them is physically impossible, let alone killing them. Also, there are hardly any mods (haven't seen one in around 3 weeks) and /report doesn't achieve anything, so the hacker problem is worse. And anyway, I value PvP quality over amount of hackers.
Next, as you perfectly well know, the new blocks and items only cause more glitches, such as the one found in one of Huahwi's more recent videos, where getting stuck in a slime block means that you die if someone fishing rods you out. This is also true for many other blocks, you simply lag back a lot more. And to top that, MCSG is one of very few large servers that doesn't have a decent anti-cheat, instead MCSG just implements things to get more money, such as decreasing the amount of servers and adding annoying and lag-causing pets.
Also, although this is not 1.8, why the HELL would I lose a game if I /kill in Pre-Game?! Whose idea was that? I know that some of the staff members have problems, but couldn't someone with a tiny amount of clear judgement remaining have stopped them?
Finally, there is the clear crashing of MCSG servers even more than ever before. Of course, it might just be MCSG devs focusing on the wrong things, but games crash way too often these days.
To end it off, no TL;DR, the post is quite clear. I know that MCSG won't revert back to a reasonable version, as none of the staff members care about actual PvP, but just want to get more money from pets, which may or may not only be compatible with 1.8 (which would explain everything). Otherwise, the update to 1.8 only is crap.