As already said - It's
always horses for courses.
We've never fancied Marmaris but have enjoyed Kusadasi, Olu Deniz and Gumbet.
We went All Inc when the kids were little and said we would not carry on when we were on our own but here we are still doing AI - because we find it so cost effective. We have to go school holidays, because of my job, and this year we have got a 2 week holiday (with great reviews) for £1800. Even allowing a meagre £20 per person per day for lunch, dinner and the (very much needed....40 degrees plus) drinks that would mean that you would need to find B&B for approx £1200 (£600 pw). That takes some doing when there are only 2 of you. It's also cheap enough to eat out if you want to.
Check the post "have I got enough money," and do the math
AI is a total blessing with kids - you never have to budget the first week to make sure that the money eeks out the second week. The kids can have as many drinks as they like - one after the other if they want.
You do have to research thoroughly though because standards do differ. Food is a very important part of any holiday.
Good luck with the hunting - we are looking for next year too even though we don't go on this one till Monday ....Yeah!