Find it hard to use Barca as a comparison for numerous reasons. Your walking into a club that has everything, the best players, the most awards, it goes on. The people that have been employed have been ex superstars of the game that command instant respect and have been preparing for this for a number of years, also, for a majority of the years they've only really been competing with 1 other team.
Unsworth is going into a team short of confidence in the bottom 3 of a fiercely competitive league with a squad with little to no balance. I do want him to succeed but I think walking into Barcelona's first team and ours are light years apart for any manager.
For them, real madrid or someone like Bayern they can take a gamble on anyone who they think might have a chance of being good. You take over Barcelona this summer do horrendously you finish 3rd or 4th. You sack the manager replace him with whoever you want, sitll have a top squad and can buy whoever you want. With us we literally could go down if he turned out to be a disaster and even if not finishing 15th as opposed to 7th makes a big difference to us in having conversations with potential transfer targets or new managers.
Chelsea finished 10th in their worst season for over 20 years, still got one of the top manager talents in the world still a top squad and won the league the following season. So much easier for teams to gamble on managers when they know the landscape for what they can achieve doesnt change. Which is why appointing Guardiola and Zidane for Barca and Madrid weren't remotely gambles, whereas for us appointing Rhino it could be a complete toss of a coin.