Momo just wasn't disiplined enough, he would lose the ball in stupid positions, his passing was often wayward and erratic, imagine Hamman, with less composure and worse passing and you have Momo. Thats not to say he was never a good player, he clearly was but for a good 6-12 months he just hasn't been up to scratch you could never fault him for effort, he was as you say allover the joint, forward, backward, sideways and he wasn't a bad tackler but as mentioned he just has been either poor or at best average within the past 12 months, Lucas is looking a much better player than him at the moment and if we can get £10 Million for Momo I'd snap their hands of.
Javier is the better play IMO , his tackling is excellent, his passing isn't bad either the only thing he lacks is the driving force like Gerrard, but who has a driving force like Gerrard?