I'm not really disagreeing with the point you're making (that MP's could use love), merely the way you're making it ("ZOMG WE BE THE WORSTEST EVAH!").
Even your statement above isn't really true.
Pets were heavily nerfed shortly after SL release. Why? Because they were smacking down pretty much everyone. For a short period of time we weren't "mediocre." Heck, I'm half convinced that for years afterwards the only reason the number of MP's were as high as they were was because MP's were very much "flavor of the month."
Tigress/SS wasn't as extreme as that, but really wasn't all that different.
Your statements above suggest that MP's suck, and everyone else is on a level playing field. That's quite obviously not true, nor is it even possible to be true. Profs wax and wane depending on the patch, and some profs are simply going to be better suited to certain things than others.
As others have pointed out, both yourself and Klod are making this discussion very flat (we suck, everyone else is uber!) when the truth is that it's far more complex than that. People tend to paint with broad brushes, and are quick to ignore anything that might suggest that what they believe isn't true.
The fact remains that AO PvP will never be balanced. If you want something that's perfectly balanced, there's always rock, paper, scissors. Or maybe FC should create a mini-PvP zone where everyone is only allowed in as Soli Advies (and only with the exact same gear/perks/etc). Since neither of those is going to happen, you just have to accept that yes, we won't ever be king of PvP (or at least not for long), but that doesn't mean we can't have a place in it.