Probably!
I decided to look up the Iris as I've heard rumours it's not quite as bad as older Intel cards. Actually looks... somewhat OK, but it's the kind of card I'd expect in a $500-ish laptop. Not a $1500-ish laptop.
As an example, here's the Macbook specs that could play the sims 3.
15-inch: 2.3GHz with Retina display
Specifications
2.3GHz quad-core Intel Core i7
Turbo Boost up to 3.5GHz
16GB 1600MHz memory
512GB PCIe-based flash storage
Intel Iris Pro Graphics
NVIDIA GeForce GT 750M with 2GB GDDR5 memory
Built-in battery (8 hours)
Price: $2,599.00
And here's a laptop I specced. I tried to pick one as close to the Macbook in terms of price, specification and physical size as possible.
Vortex Series: 15.6" Matte Full HD LED Widescreen (1920x1080)
Processor (CPU) - Intel® Core™i7 Quad Core Mobile Processor i7-4910MQ (2.90GHz, turbo to 3.90Ghz) 8MB
Memory (RAM) - 16GB KINGSTON SODIMM DDR3 1600MHz (2 x 8GB)
Graphics Card - NVIDIA® GeForce® GTX 870M - 6.0GB DDR5 Video RAM - DirectX® 11
Hard Disk - 480GB KINGSTON HYPERX 3K SSD, SATA 6 Gb/s (upto 540MB/sR | 450MB/sW)
DVD/BLU-RAY Drive - 8x SATA DVD±R/RW/Dual Layer (+ 24x CD-RW)
USB Options - 3 x USB 3.0 PORTS + 1 x USB 2.0 PORT AS STANDARD
Firewire - 1 X 1394a FIREWIRE PORT
Operating System - Genuine Windows 8.1 64 Bit - inc DVD & Licence (£79)
Price: £1,494 (with tax included, approx USD$2540)