There isnt really a lack of control though, a player who wants to use the weapons they got can just skip the swapping shrines and go for the tempering ones instead. Random stats aside that does at least ensure you wont have problems with THP and the like for the most part. Which is good.
You wont be a shade that goes from having a Sword&dagger with a painbuild to a painbuild with a 1handed axe…which only really pains you and your teammates when it occurs. And other careers similarly have weapons that will just ruin them if added to the wrong setup which kills the fun very quickly…
I´ve had several runs getting really, really bad weapons and traits that got me killed in the next few melee fights since…well i couldnt fight much of anything really. Boons too but that´s another topic.
How arent they good though? They are fairly cheap and if you get lucky you can get very strong stats from early on. Plus hero power is priceless since its boosts damage, stagger and cleave(some weapons).
A strategy i like using is upgrading 1 weapon to green (50 more power) then in the next map upgrade the other to blue (100 more power) then upgrade the green weapon to orange in the one after. If i just keep going like this i get a lot of power for each upgrade and i have a fairly good shot at getting rather helpful stats too.
The reason i take that order is because i figure it´s better to get pilgrims coins bonus on the ranged weapon and the chance is bigger to do so on the blue shrine when i add 2 new properties.