I think it IS more complicated than WP for some reasons:
It doesn't come with a really working default template and acompaining CSS, so you have to built your front page nearly from scratch;
It uses it's own language (TXP tags), which you must learn to built anything - using plain PHP seems a much easier concept to grasp, at least it was for me;
Documentation is lacking (but they say it is "gamma" software, whatever that be);
And of course the backend in unfamiliar - but it seems for example easier to use images than in WP, you don't need to install a hack for that (tough i haven't played with that feature).
The Sections/Categories distinction is a bit surprising at first, but after you read this it gets pretty clear.
Sushubh: you probably didn't upload the .htaccess file that came in your package, some FTP programs don't see it. I had this problem. Or your host doesn't allow the ForceType directive, which is essential for the clean URLs to work - in this case someone has made a mod_rewrite rule available in TXP forums. If that's to much work just for checking the software out, turn the clean URLs off and it should work.
(again, i am not promoting TXP here, far from that, i am only advocating the Sections/Categories distinction, which i would like to see in WP)