Pounce does not preclude using weapons. The pounce provided by Beast Totem, Greater does not specify that it only works with natural attacks. The catfolk feat, for example, does specify natural attacks only. Plains druids get pounce, no limitation on what to use it with.
All the things that turn into stuff with natural attacks are actually a little more fearsome than a normal weapon user. Every natural attack is taken either at full attack bonus or full attack bonus -5. A lion, for example, gets 2 claw attacks, a bite attack and a pair of rake attacks all at its full bonus. Eidolons can also wield manufactured weapons with their pounce ability (and can have a dozen or so arms, if you wanted to pay for that many longswords).
Titan Mauler Barbarian 2/Two Weapon Warrior Fighter X can dual wield greatswords if he wanted.
I also forgot about Mounted Skirmisher
which lets you take a full attack if your mount moves less than its speed. With movement speeds of up to 120 feet, and no preclusion on charging, Mounted Skirmisher is an integral part of the new ubercharger build (called RAGELANCEPOUNCE).
What I'm saying is that pounce isn't, in and of itself, overpowered. There are far too many ways to get it for it to not be basically an integral part of high level play. What is actually overpowered about your sword is that it's free. The same as everyone else's legacy item. If you'd had to spend money on your sword to get it to do what it does, you'd have other glaring weaknesses. Had you covered up your glaring weaknesses, your sword wouldn't be that awesome. Basically, you picked one of the most powerful melee combinations (second only to AM BARBARIAN, RAGELANCEPOUNCE and beastmorph vivsectionist alchemist) with the statistically best melee weapon and focused heavily on it. At high level, you can one-shot some relatively lower leveled foes; this is as it should be.
The three casters all seemed to opt for relatively tame builds, but we could very easily have been shutting down whole encounters with our standard actions if we tried (and had the information necessary to prep). Killing a single foe each round is perfectly fine by me in those circumstances. I am somewhat of the opinion that, by 10th to 14th level, all melee-focused classes should have a way to do more than a single basic attack with movement.
Pillows are designed for relaxation. If they are fighting, what hope do we have?