@Raichu311
The
short (even though it won't look it) answer is that the Versus Ladder isn't for casual play against a variety of decks. It is a shame there isn't a mode for that, but the Versus Ladder is somewhat like a tournament; however the PTCGO determines your record, it tries to find someone with a like record to match you up against them. This, in turn, means you eventually blow past the people who have little skill and weak decks, the people who have little skill but good decks, the people with good skill but weak decks, etc.
So... that means as you grind, you're eventually filtering out all but the time-tested decks in the hands of competent (or better) players. You might get lucky and find a good player with a creative deck, but that can backfire if it turns things into a one-sided matchup; it is better to get curb stomped by something creative than something boring, but it is still getting curb stomped. You may also be fortunate and find a
lucky player (creative deck or the same old thing) who got higher than he or she should have, or face someone better than you but who gets a bad open, etc. but mostly you reach a point where everyone is as good or better than you, and using
what is proven.
The best answer is, if you can afford it, a short "vacation" from the PTCGO
or at least its Versus Mode. Well, since you aren't already playing things other than Standard, I also recommend
all the Formats supported by the Versus Ladder. Yes,
all the Formats: Theme, Expanded, and Legacy. Even if they are individually stagnant, they are often different enough from each other (and Standard) to give you a more diverse experience. The SM-series of decks have been a mixed blessing for the Theme Format; they are
almost as good as I think Theme Decks ought to be so that the Theme Format isn't so tedious
but also making it pretty clear what decks to play (the most recent SM-era one you have, give or take Weakness trends). People championed Expanded earlier; I'll just add that when Expanded does tend to get hidebound, at least it also tends to be
fast. Well, unless you're facing a lock deck. >_< The Legacy Format tends to experience punctuated equilibrium; it'll be same old same old for a while, until new discoveries (rediscoveries?), more people acquiring the harder-to-get older cards, and counters for the top deck suddenly make the current top deck the old top deck.
I'm pretty behind on the PTCGO metagame right now, however; I've been busy with other projects.