Not trying to sound like a biased douchebag or anything...But...Never really seen anything too good from Lenovo personally. Then again, I've stayed away from them a long long time ago. You ever consider MSI, Acer or Asus? I've seen and experienced personally, amazing laptops made by them, that I've never seen with Lenovo before in my life.
Laptops are pretty tricky. A lot of the major players in the market (Lenovo included) don't even design their own laptop models, they subcontract an ODM (original design manufacturer) to design and build them, and slap their logo on them (sometimes with customizations here and there, depending on how large the company is). That's one of the many reasons that the quality, feature set, and build can vary so much even between different models within the same series.
Just as an example, you might feel that Dell and HP have nothing in common, but both the Dell XPS and HP Spectre were
designed and manufactured by Compal, an ODM based in Taiwan. Similarly, several of the products MSI and System76 sell are little more than rebadged
Clevo laptops. It's possible for one company to use multiple ODMs as well, so you can't say that all Dell laptops were designed by Compal. It might be a Quanta, Inventec, Wistron, Pegatron, or Foxconn design, depending on its age and model.
So, yeah, it's pretty likely that the Legion wasn't designed or manufactured by the same company that designed the lower-end Lenovos. The only fair metrics you can really use to judge laptops is by how good that specific model is and how good the company's support is (should you need to use it). Beyond that, it's anyone's guess.
It's complicated, it's annoying, and it explains so much of the inconsistent hardware-related crap I saw when I was still doing IT field work.
Really can't justify getting a laptop over a desktop unless you travel a lot or (like me) just wanted one since childhood and only now has the A money, and B a (albeit not strong) reason to justify getting one.
I'd say the pendulum is kinda shifting with the rise of Thunderbolt. If I didn't do much PC gaming, I'd use a laptop along with a TB dock for everything. Plug it in and it's effectively a desktop: charging, displaying to my monitors, using my keyboard/mouse, on a wired network, and connected to my hi-fi. Unplug it and I'm fully portable again. It definitely helps that there aren't as many compromises with laptops as there were 10 years ago.
Laptop gaming is still kind of a niche thing, of course. I'm not sure how many of them support docking, but it wouldn't surprise me if they also started pushing into that direction soon. Kinda seems like it would be a marketing boon to me.