I like seeing shards in the market. occasionally I even go on an uncommon buying spree.
The problem is that uncommons should just be 2* chickens. It makes no sense for this very basic resource to take up space, having to transfer them from one vault to another by hand, etc.
It also makes no sense for endgame players to be offered 3-4* gear in the market.
I don't hate the things I buy, I hate the time it takes, which is too long for something refreshing 1/hour. Making me filter through useless stuff, click twice on each thing to buy it. It takes about 5x longer than a well-designed market would. Also, the weird easter-egg hunt for ancient shards. If it's supposed to be 5/month, why not just put them there in a permanent slot with 5/5 stock that refreshes on the 1st? It's not about getting more free stuff, it's about fewer pointless barriers to getting what we're already getting. There's no skill, no challenge, not even suspense. It's just a pointless time waste for every serious player (who will get whatever resources they need out of the market anyway, regardless of these trivial hurdles).
Now multiply this annoyance by all the areas Balltazer mentioned. Playing raid is like ordering a plate of lobsters: there's something delicious inside, but the waiter just hands you some weird tools and expects you to fend for yourself.
(By the way, I'm pretty sure the ancient shard code is bugged somehow, as I often get offered fewer than 5 before they disappear for the month)