I enjoyed Witcher 1, more than 2 in many ways. The engine was older, graphics and what have you too, but I thought the characters, the world, the story and gameplay were fantastic. Having to make difficult choices that alter the path, and outcome, of the game was interesting and the story didn't paint anyone particularly well. I liked the Shani/Triss arc and Calvin (?) was fascinating. The revelations at the end were cleverly done and woven right into the characters and story.
I didn't mind the combat. Remove the timing aspect from it and it's just button mashing. The timing thing added an element of skill to combat that traditional RPGs lack. You have to pay attention and try and a mistake can alter the outcome, as it might in real life (I'm not suggesting combat is or need be realistic).
2 was okay, but very slow. I made the mistake of playing it when it first came out, pre-enhanced edition. The intro was ludicrously tough, the UI was cumbersome and the FoV felt very closed in. It was very KB/M unfriendly too and my suspicions were that they had made a console/cross-platform game (I believe it did end up on consoles, so my suspicion was borne out) that was much less fun to play on the PC than its predecessor. A controller and the enhanced edition made all the difference and I managed a full playthru a few months back. I did like it...I loved the story. But I don't think I liked it enough to have another go and see the game from Iorveth's path, much as I'd like to know how it plays out.
As for TW3, I'm very excited. I'm interested to see how Ciri and Yennefer fit into the world and how they relate to Geralt. I'm interested to know the whole backstory now that Geralt has/will have his memories back and of course, how we can influence a sandbox Witcher game. The Nilfgaard Empire's war will be a great backdrop for the story and action and I'm most interested to see how past choices feature into it too. (f.ex the main antagonist at the end of 2, whether we removed the crystal or not. How do the Scoia'tael fit in, King Henselt (alive or dead), Anaïs's fate and of course, Triss!).
I'm very interested to see how Yennefer and Geralt are with each other (at least she with him), especially with Triss in the picture. In the books, Triss is a minor character and Yennefer is Geralt's real love. In the games however, Triss is the major part of Geralt's life and Yennefer a forgotten memory. Can't wait to play and see how their relationships develop...with Triss being (my) Geralt's love, how can Yennefer compete when we, the player, have known her only briefly? Knowing CDPR, it will be complex, deep and difficult as any choice and equally have a profound impact on Geralt and/or the game.