I'll not argue that other bullets are inferior, they all work and produce dead deer, I will say that while the paper ballistics may not show a huge improvement, the results on the ground are significant.
When I tested them against the 170 and 150 gr. bullets I've been using, the LE's had more penetration, larger expansion and massive internal damage, this resulted in "faster" kills, usually in sight of the shot and often just bang flop. Less then ideal hits also were effective. With similar shot placement I've noticed a big improvement with the LE's and thats having taken over 50 deer with them alone, that's way more then needed to see the average...I don't care if they shoot farther or faster, I care that I can easily find deer taken at dusk, in snow or rain, and on small properties. They are "better" for me, YMMV.
But accuracy is important, find and use what you feel works for you.