Well it may be rubbish for Farang, but for Thai market it works extremely well.
Their mobile app is superior, they release money to the seller only after you confirm everything is ok with the order and their voucher program is more appealing. I have started using shopee food over grab now as I can get some incredible deals.
The only problem is that unlike Lazada shopee does not accept foreign credit cards and I like collecting my points. However bigger savings more than make up for it,