The 860m - which is the cousin of the GTX 750 Ti - in shrunken down form - is NOT a slow card or a bad card by any means @ 1080p. The issues that you may run into with that particular card at resoltuions higher than 1080p are:
- Not enough cores to provide the necessary information for over 30 fps / over 60 fps gaming
- Not enough memory bandwidth for greater-than-HD gaming. I've tried my laptop's 780m with 4K, and I max out the memory and the bandwidth, and I'm lucky if I get 30 fps on medium to high (and the performance of a 780m is about that of an overclocked GTX 760). You'll do OK at 1080p gaming, but only at medium to high with no more than 2XAA on the latest games
- If your budget allows, I would try to swing the extra inch of screen and get a Razer Blade (2014). Great screen, has a quad-core / octa-thread CPU, but more importantly it has a GTX 870m. The 870m is basically a GTX 660 Ti with a *very* mild downclock. It's not much larger, has the same 3200x1800 resolution screen, and has more VRAM, more memory bandwidth, and more cores to deal with the information.
I would also look at 15" models from companies such as Sager, yes they're bulky and only 1080p, but they have full GK104 cards in them (read: 1,536 CUDA cores / 256-bit memory bandwidth), and unless you plan on gaming at 3K or 4K maxed out (ie: MSAA, Downsampling, etc.,), they should have MORE than enough power for mobile gaming for at least the next 3 years.
How do I know? My sager has a 780m and an i7-4800mq, and just to get under 60 I have to turn everything to ultra and turn on downsampling in Project CARS. Otherwise, it tends to run 90-fps plus on most racing games, maxed out @ 1080p.