Isakaya is a hit ans miss kind of place. I've been here quite a few times and I have to say that 80% of the time the food is awesome but every now and then I've had so so food. I think this maybe when to cook has a day off or is on vacation.
Isakaya is a family run restaurant most of the wait staff and kitchen staff are related giving it a nice ambiance. You may not feel the family vibe the first time you go but once you go two or three times you'll start to feel it.
I find the sushi to be good, not the best ever but very good. The dishes I prefer here are the unagi pie and the black cod. If you happen to come on a day when the main cook is on duty then you wont be disappointed. To tell the truth it's worth taking the chance because even if you don't go on a day when the main chef is in the food will still be pretty good.
Isakaya is worth a try.