Everything is relative and YMMV.
This is very true.
This reminds me of a story.
So several years ago, after conquering the dragons that were the panel of professors judging my thesis, I found myself sitting in the auditorium, joining the graduation rites for earning my Master's degree. I was pretty happy and content, I kicked the butt of everybody else in the class, and they were gonna hang a medal around my neck or something. Pretty sweet.
So as the graduation rites went on (and on, and on, and on...), I got a text message from a friend of mine. His message read:
"Dude, awesome advice on the new hardware! Left for Dead plays awesome!" (He obviously had no clue I was attending my own graduation rites). Since the graduation rites seemed never-ending, I decided to engage my friend in the magic of instantaneous communication through SMS.
He was absolutely thrilled at his new hardware, an entirely new PC on a completely shoe-string budget (at that time, he was just starting out in his career, almost fresh out of HRM; he was a Starbucks Barista, so very lowly paid, bills to pay and all). I was, of course, very glad that my awesome barista friend enjoyed the hardware.
The thing is, that hardware, from our (AT forum enthusiasts) point of view, is absolute crap and "not made for gaming!". It was a GT 210, newly released (I think it was summer of 2009 then). I didn't want to recommend a GT 210, but when he gave me his budget, and we browsed the pricelist of my favorite store, he really couldn't afford anything else that time. I wanted to steer him towards a better card, but at the end of the day he really had to settle on a 210. I was rather sorry for him, to be honest, and part of me just wanted to give him money - after all, no one should be "forced" to play games on entry-level cards, that's just downright dehumanizing, right?
Anyway, so it turned out alright, and he was super thrilled and excited he could finally play L4D and some RPG and an MMO or something, I don't really remember. All I could remember, at that very day when all I should have been thinking about was
"when the hell are they gonna hang that medal on me, we're losing daylight!", was "Wow, that turned out better than expected for him".
The moral of the story, as Magic Monkey pointed out above (which I quoted), asking "what is sufficient for gaming" is hard to answer, and most replies may not apply to you, especially here. The more useful answers are YMMV, <1080P at conservative settings, depends on games you play, etc, but whether that is sufficient depends really on your expectations.
Enthusiasts want graphics in their full-glory (naturally, since this is a tech forum), so they will be prone to downplay what is good enough and settle on what more casual/normal gamers might consider excessive. That's all well and good if that is also your personal level of "sufficiency". Otherwise, if, like my friend, you would have been satisfied at a much lower level of performance, you might end up over-provisioning for something that would not have made a material difference to your enjoyment. For example, using 20/20 hindsight, I see now that if I were able to convince my barista friend to spend more dough on a mid-range card, it might have done him little good if he was already super pumped at the entry-level. Obviously, his standards and expectations were lower than mine, and he didn't require a mid-range card. I wouldn't have known had he not settled on a low-end card and reported his enthusiasm, and I could never have imagined such enjoyment from low-end. As an enthusiast, such a thing simply does not register in my brain.
If you don't know yet what is borderline acceptable for you, you may not be able to judge properly what minimum hardware you will need to play the games you want sufficiently even by looking at benchmarks. There is no single answer that can guide you, and no member here either can give you a perfect answer (i.e., perfectly right on the spot for your needs and budgets). Try out your friends' laptops / desktops if possible to see what level of hardware is "good enough" for you before you buy, if at all possible, so you can be in a more-informed position before settling on a Haswell-powered laptop sans dedicated graphics.
EDIT: Of course, I'd also add my personal view on Haswell graphics. In laptops, HD4600 will most certainly be good for lots of gaming. It won't be high-end gaming, and you can't have all the bells and whistles in every game, but it has enough muscle for you to enjoy lots of games on it. Even more if you are willing to drop settings as needed, or even drop the resolution and play in windowed mode (so still native res of the LCD is in effect for sharper image) or not mind not being in the native res of the screen.