It's mainly the transfers imo. They've sold excellent players and replaced them with mediocre ones, which is surprising given the quality in the Bundesliga.
Sokratis is a top level defender and was a major steal for 10 Mil. €. Aubameyang for 13 Mil. € has also shown constant improvement, being by far our best offensive player in the first half of the season and second only to Reus in 2014 overall. Getting Sahin back for 7 Mil. € was also good business. The guy is extremely important in giving a team structure (as seen yesterday) and him being injured for the whole first season half probably hurt us the most.
The jury is still out for Immobile (strikers having a hard time under Klopp at the start is hardly a new thing and you can see development) and Ginter (young, raw but undoubtly talented). The second season half will show if Kagawa has lost all of his edge at United or if he manages to rediscover his form again. Kampl looked promising in his first match.
In hindsight, the Ramos transfer was probably not needed and Mkhitaryan was a couple millions too expensive, although the latter still played a good first season.
Putting the blame for the god awful first season half on the new guys is hardly fair, though. The way bigger issue was the established players (Hummels, Weidenfeller, Pisczu, Bender, etc.) letting the team down. Nearly the whole squad underperfomed. Klopp now had a couple of weeks to make adjustments and I have seen that yesterday. We finally stood stable in the defense most of the time, reducing the number of shots from one of the best offenses in the league to a season low. This was mostly done with a fairly destrucitve way of play, but giving the situation in the offense (Reus/Mkhitaryan coming back from injuries, Aubameyang/Kagawa coming back a few day ago from their tournaments, Kuba/Gündogan injured) it was a tactic I can completely stand behind. This was not pretty, but being the better team has hardly brought us results so far in the season (half a dozen of our losses were against worse teams) and if that is the way vs. top teams to get out of the relegation zone as soon as possible, then so be it.
Overall the last game was a step, a tiny one, in the right direction.