Again, Carr is Carr, Luck is Luck. Luck didn't come into a great OL situation & though they tried, the Colts weren't able to fix it before having to pay Luck.
I think you draft QBs based on how you as a team feel about him. You get a guy like Luck, everybody will probably feel good about him, a guy like Goff... some teams fell in love with him. Watson is more like that. We may have been the only team to fall in love with him, but he was the one. I'd rather they fall in love with a guy, go get him & figure out the rest, instead of taking a guy who grades well, just because he grades well.
We don't have the worse OL in the league, not even close. There's work to do, but a good coach/QB should be able to manage. The Texans don't appear to be rushing Watson out there (contrary to what I originally believed) so we'll see how it works out.