A recent class I taught at Emory Continuing Education was on How to Add E-Commerce to Your Website. The students used seven common open-source shopping carts and rated the. OK, this is admitedly horribly non-scientific, but should be somewhat telling. Here's the results:

1-5 scale, 1 being worst, 5 being best

Magento: 4.7

PestaShop: 4.5

WooCommerce: 4

X-Cart: 4

ZenCart: 3.5

OSCommerce: 2.5

VirtueMart: 1

As Paul Harvey used to say "For What It's Worth".