I actually wouldn't agree, or at least not entirely. I mean I can't speak for how it was at launch, but I mapped all the keyboard bindings and found that I actually much preferred the level of control and the feel of it. It is quantifiably better, or at least felt like it to me. That said, I still went back to controller because I just kept forgetting what all the goddamn buttons were, haha. Got tired of opening the menu back up to remember what I'd said this or that to since I'd already gotten my momentum going with the game and just wanted to play it. That, and there were several instances where I guess I'd forgotten that I already mapped something and remapped it to something else, so then in-game when I went to use it the little overlay would tell me there was no key, and ... ugh. It's just kind of an issue when you have a game with so many dedicated buttons.
Though to be fair, it's mostly the game's fault. A lot of those buttons should be multi-use like they are on the controller, and shouldn't require you to come up with a separate button for them. If it wasn't for that, I'd be playing with a keyboard and mouse for sure, but as it stands I just can't quite get a comfortable setup that's easy enough to remember and also 100% complete. If I'd done it right at the beginning and put more effort into it, that would have been one thing, but at this point I just want to play the damned thing, no muck around with relearning controls (which is more of a big deal for me as I'm playing on death march, which doesn't leave too much room for error).
EDIT - I started to write up some more thoughts on how I'm feeling about the game, but I feel like I need to save these for a blog post when I'm a bit further in. I'll post a link here when that happens.