At least you've got useful CEs, so your supports can be put in the backline and give bonuses.Behold my amazing event support lineup. I'm sure my friend list will get carried by them.
The only one of my supports people might use during the event is Waver with the non-MLB 3* CE on him. My Emiya is leveled, sure, but Nobu gives a better bonus so there isn't any reason to use him over her (and mine is still at lvl 40). I might as well not put any of the shop CEs on my Servants, because if you're farming points the only support worth using is Okita.