IMHO, Roman doesn't necessarily want to see Chelsea play football like Barcelona. What he truly wants to see is his team dominate and control games. This is why Roman wants Guardiola to be Chelsea coach so badly. No football team on the planet has dominated games with flair like Barcelona in recent years.
However, Guardiola was unavailable at the time, leading Roman to hire Benitez--because Benitez teams tend to dominate games, like his title-winning Valencia team and at-its-peak Liverpool team (dominated most games but drew too many). The recent 8-0 thrashing of Aston Villa is exactly what he wants to see, Chelsea dominating the game from start to finish (and Torres scoring!).
Why does Roman want to see this type of "dominating" football? I think this is because he sees Chelsea FC as an extension of his personality--he may feel that Chelsea represents him publicly, which is why he wants to see his team consistently dominate opposition and control games, just like he dominates people and controls "games" in his own life.
Although RDM did an amazing job last season winning the FA Cup and Champions League for Chelsea, his teams never really dominated games--it was more of a suck-up-the-pressure-and-score-on-the-counter approach. For this reason Roman was never fully convinced by RDM, leading to claims that RDM just got "lucky".
At the start of this season, even though RDM's teams were winning with flair, they still did not fully dominate games which is what ultimately cost him his job. Since Benitez has come in, Chelsea has definitely started to dominate matches for long periods and opposing teams are starting to "park the bus" and play counter-attack tactics against us, especially when Chelsea play at a high tempo.
If Benitez keeps Chelsea dominating matches and wins a few trophies this season, it's totally possible that Roman considers him for the permanent job (although we all know this "permanent" thing is just an illusion at Chelsea!). Even if Guardiola becomes available, Roman may decide to stick with Benitez as Chelsea starts to play like his title-winning Valencia teams which consistently dominated opposing teams like a killer robot, shredding even the best teams to mincemeat at times.
Benitez hasn't done his chances any harm with a few smart moves at Chelsea: (1) getting the balance in the team right and fitting players into their best positions, (2) getting players to cross earlier and stick closer to Torres, giving Torres more chances to score, (3) moving David Luiz into midfield, giving the team both more attacking threat and more defensive stability at the same time, (4) having the foresight to recommend that Chelsea sign proven goalscorer Demba Ba at a relatively cheap £7 million, and (5) blooding in new youngsters like Piazon and Ake.
After all that's said and done, Roman just wants to see Chelsea dominate matches? What do you think?