Ciya is famous for serving different styles of Turkish cuisine drawn from all over the country. Sometimes though, it seems more thought has gone in to making something appear "different" and not so much to the overall appeal.
I tried the vegetarian lamacun since I haven't heard of anywhere else that serves this. It was disappointing however, although the base was nice and crisp, the topping was dry and largely flavourless. Similarly with another offbeat starter, olive piyaz. Normally piyaz is a bean and salad mixture with vinagrette, in this case the beans were dumped entirely and replaced with green olives, resulting in (more or less) a plateful of olives in vinegar. I like olives, but I'm not sure anyone could really eat this many served like this! Still, it's nice to see something that's both veg. and different from the usual.
Good aspects of Ciya for vegetarians and vegans is that there is a reasonable salad bar and a number of other veg options such as the more familiar falafel and pide. The staff are also accustomed to catering for vegetarians.
If you're thinking of visiting and trying something new, I would suggest ordering a mixture of more familiar dishes and new ones. Prices are slightly higher than average but can be worth it to find some interesting new flavours.
Cons: A bit over-hyped, not all dishes great, Can be expensive