Come for drinks and the atmosphere, and hang out with friends.
Food wise - just stick to the recommended items on their menu (it will tell you which one) and don't expect portion sizes you'd find at other Asian restaurants in the nearby area. The non-popular dishes are really not that good and you won't be happy paying for them on your bill.
Service is good when it is not busy, but when it is, it's still not bad.
For comparison, I've been to three different Kinka Izakaya locations, in my experience it is similar to DonDon but overall a little better in almost every aspect. However, it's hard to beat DonDon's location in the heart of downtown.
*Review written on my fourth time here, two people, Friday night dinner time, seated at the bar, ordered 7-8 different dishes. Two drinks. Roughly a hundred dollar bill pre tips.