Is laptop good for gaming?

Lenovo makes dozens of models of laptops. Some will be ok for gaming, others will be just awful for it. It depends on which one you buy.

Laptops are the old trend from the late 2000s/early 2010s, Iphone, computer and xbox are what's more popular now since the last two were but why own a laptop when you can do the same thing on a phone

No. I had a Lenovo and I used it strictly for gaming. Don't use it.
It will work just fine at first, but then after a while of using it, it will get slower and slower within a few months.
It's best to get a desktop or a gaming PC. But no, do not use a Lenovo or a laptop at all for gaming unless you're okay with constant lag.

Personally, I have a lenovo laptop and i use it for gaming all the time. It runs GW2, Wildstar, Hearthstone, Overwatch, and WoW.

I wouldn't call it "good" but it does the job. If you have the money i'd get an alienware laptop.

Overall, a PC i believe is better for gaming.

The performance of the laptop's graphics chip is what determines how good it will be for gaming. A list like this one makes it very easy to compare graphics chips to see which is faster:
http://videocardbenchmark.net/high_end_gpus.html

Yes

Yes, but laptops worth gaming is very costly compare to a desktop. With the obvious restriction that you do have to buy the very costly machine upfront; with no such option as upgrading the parts later on that's available to a desktop.

A desktop is more durable than the laptop.