IMO Silas is a great fight, grug is not. The difference is that Silas is all about coordination and a bunch of fun little mechanics that once you learn you have to react to things in different ways. I also like that the adds spawn in a slightly different order so each time you do the encounter it'll be slightly different.
Grug, on the other hand, is a long gib fest where you have to do the same/similar mechanic over and over and facerolll and still die because of gear. I understand having that check in Murdantix, but to have Grug, Sicaron and Murdantix just isn't as inspired.
Matron, Silas and Molinar are great fun though.
Needless to say, next week will be an interesting one.
Eldritch Knight Brod - 50 Mage Rank 8 Briarcliff