Nice ep, Rider's Ulti seems pretty lack luster, what capable Servant would let something so big and obvious hit them? Maybe Berserker could just take it, but all the others we've seen would probobly just move. Rider was probobly at a disadvantage fighting in that close quaters environment anyway, she seems to wide places with lots of cover, like what the preview showed. From the preview she should be at her top form whem Saber grinds her into the pavement, maybe she'll whip out the lightning blade again.
Shiro does have talent, we've known that for a while, he just lacks skill. He seems to be tapping deeper into his resevior of power, hopefully by the end he'll have learned something about control and finesse and will be able to tap his potential better.
Something else I noticed, from the way Shiro talked about that fire that happened ten years ago, it sounded like he was more than just a victim. Perhaps he had something to do with what happened, and felt bad about it untl Kiritsugu found him. THis might also explain why Kiritsugu never taught him anything, either fearing what Shiro could do with control over his power, or not knowing anything about the kind of power Shiro actually had.