There's skyrim I suppose - it has dragons in it which are rideable with a mod (although it is pretty rubbish) and has a playable lizard race; the Argonians. It has three storylines you can follow and it's open ended.
The Witcher series of games are good if you want a story based game which I would definitely recommend - the third game needs a hefty PC to run it though.
Divinity 2 is a unique game which there isn't anything very similar to it. If it's dragons you are after the best dragon game is Drakan which the first game is available on the PC and the second the PS2. Both are very old games now and it may be difficult to find a copy but if you do they are worth playing.
