Acer's build quality varies widely by model. If you have a model number, you could lookup reviews for that model to ensure that there aren't any quality issues. Asus and lenovo are generally ok. Don't know much about Fujitsu laptops, so I can't comment there.
In terms of graphical performance, the 610M is essentially equivalent to Intel's new HD5000 integrated card. So you can play LoL or other non-demanding games. The 635M will perform better, especially when things get hectic on screen and will let you play more demanding games in low settings.
I wouldn't recommend the Acer at all since for $25 more, you can a better graphics card, a bigger hard drive, and from a more reliable brand. So it comes down to the Asus or the Lenovo and it really comes down to price and if you expect you will fill 500GB.
Do you want to pay $100 more for a better graphics card and a bigger hard drive? A 500GB external HDD will cost about $50 so keep that in mind as well.