It's hardly minute, though I will admit it's not a huge heal, it wins trades. And it's free health if you combo and run out, that combo being E, Q+AA, Q+AA, which automatically bumps it to 4 stacks. And even not at four stacks it's still potentially infinite as long as you hit something once every 6 seconds. Not to mention Lifesteal should be the first thing you get in lane, almost unconditionally. As for Tryndamere, yeah, it's kind of hard to be better than five seconds of "haha you can't kill me RUN CARRY RUN AHAHAHAHAHAHASDGasnfdsagjk", and on top of that he hard counters her, so that's not really fair even despite her strong laning phase. I'll give you the jungle thing, though, as I've only tried it once and I never want to again.
And she's not necessarily outclassed; she works well as an AD top for an AoE comp, as well as this-
http://www.pokemonreborn.com/forum/index.php?showtopic=3314&page=24#entry65131