I agree that the store search and browsing are all over the place.
Search: sometimes it's stuck in "we don't find anything" even if you put names of games you know IG has; you have to go to the main page and search there to "reset the bug". This can happen several times during browsing.
Browse: select some filters, select "on sale" and select "by lowest price". Not sorted correctly, and it's arguably one of the most useful sortings to spend that little galacredit you have remaining. "By best savings". If it's sorted, I don't understand the method. "By percent off". This visually seems to work. However once you advance the pages, you keep seeing games repeated, that you've already seen in previous pages. So, does that mean that there are games you've not seen that have been "reassigned" to pages you've already visited? Then the browsing is broken too.
At least the filters seem to work, tho I select "games" only but I keep seeing one or two DLCs.