This thread is still a general No Mega ladder discussion right?
The ease in speed creep is actually pretty noticable. While it is easier to look at Zard-X, Gard, Gross and the like being gone and looking at the ease in teambuilding from that perspective, the loss of the 135+ group, and even Pidgeot and the 115s to an extent, have impacted building. In past generations, to get to a level where you are above the whole meta speed tier wise, you were either weak strength-wise (see, Crobat and Jolteon), locked into a move by Choice Scarf, relied on external factors (ie weather sweepers, most of whom were given the boot in gen 5), or they had to get rid of coverage for the sake of a speed boosting move (example, AgiliCross). Now, in XY? You've got Manectric, Sceptile, Lopunny and others running wild. These things have great speed tiers, decent power, and usually great coverage. Not that these things are even close to broken perse, and hard stall can handle them pretty well and they all have viable hard counters. But balanced and bulky offense? Those builds often have to bend in some pretty interesting ways to even check all that fast stuff in addition to other straight up wallbreakers. It's pretty frustrating that once you've built a squad that can check all the big bashers in OU, you go out and run into Mega Zam, Mega Houndoom or Mega Sceptile and it rips this supposedly well-built squad wide open. Any balanced player knows this feeling all to well. None of these Megas are themselves remotely close to broken but the combination of the fast, wide coverage Megas, combined with the insanely powerful wallbreaking Megas, further combined with powerful Legendaries like Keldeo and Landrous starts to paint a picture of the so called "match-up problem" that exists today.
In a related note, the Weaviles and Torn-Ts of the world are doing pretty well. LO Zam is a pretty great cleaner as well. Offensive Starmie and Raikou look more effective than they are on the real ladder, and that's saying something with how good they are on there. Overall I'm really liking this ladder, and this experiment has some real potential to learn more about what exactly the general stat creep does to the metagame.