Was a bit in doubt about watching this but gave it a shot. I'm not disappointed.
A bit in general and Episode 4:
So far, the fight sequences have been pretty cool, the one in this episode was particularly awesome.
Okay antics for comedy, cool fights and happy, (kinda) normal living Ilya, that's nice.
The servants being the "bad" guys is also interesting, Caster was pretty difficult for them and I'll be supposing Saber's gonna be a beast in the next episode, especially coming after the previous fight with no room to catch a break xP