Credit to Lucho where it is due; Barça's home form is not significantly different from the previous two (post-Guardiola) seasons and he got the home games v PSG and Atléti spot on. They've looked broken and top-heavy, especially in the away games where they often struggle to impose any meaningful measure of domination. Last night looked for the first time like what Lucho's Barça could be at its best. The biggest worry is still the burden of chance creation almost solely on the FW line (specifically Messi, but lately also Suárez); when they have space to work with they will be devastating, as seen yesterday, but v deep 9-man defenses it's increasingly difficult to replicate that same level of threat when the MF isn't capable of creating for them.
The criticism of Lucho's rotation in se is unwarranted (as similar happened under Tata Martino, and let's not even mention Guardiola's penchant for experimentation in the biggest games), but his team selection has at various points baffled (most significantly of course the game at the Anoeta). I think the biggest issue with Lucho is that he doesn't exude confidence in a way a Guardiola or Mourinho, or even the likes of Simeone and Klopp, do. Couple that with his authoritarian/disciplinarian stance and his shying away from interaction/communication with his players (e.g. the extended holiday fiasco) and you get an easy target when it all goes wrong. Let's leave it at this: he's doing a great job results-wise, however performance-wise there are a lot of signs that it's a very fragile construct (borne out by the recent full-blown "crisis").
While I don't think he's a tactical genius -- the shift in chance creation responsibilities may have strengthened them defensively (debatable), but it's significantly weakened them offensively in away games --, he's clearly not clueless (stubborn might be a better word) as evidenced by the dismantling of Atléti. The average position diagrams clearly show the width provided by Neymar and Messi, which is the most logical weapon to use against this very narrow and compact Atléti side. By keeping the pitch big and wide they found the spaces they were so lacking last season v them. On that note, an observation: Atléti have clearly suffered from the loss of Felipe Luís at LB, as Cristiano, regularly taking up (unusual) spaces on the RW tore them (and Siquiera in particular, winning the pen for their only goal off him and setting up some great chances) apart in the 1st half of their league encounter, and now Messi had Gámez at his mercy and was the instigator/creator of all three of his side's goals + that sitter Neymar missed.
Neymar and Suárez were lively and constant threats, Piqué was a rock (apart from one silly moment v Arda) and props to Rakitic who was excellent too, especially his role in Messi's goal was very impressive. Messi would be my MOTM though; he indeed had a fire in his eyes that we'd seen intermittently this season, but had lost some of its glare lately, and he was everywhere, orchestrating their attacks so well.
Tata Martino had started to take Barça into a more direct and vertical approach last season, which translated into one of their (if not thé) best ever 1st halves to a league season, but very abruptly (and under pressure?) returned to the more measured, possession-oriented style of his predecessors which is where it all fell apart for them in the 2nd half. I don't think Lucho will part from his principles like that (it probably helps that it falls somewhere in between Tito's "tiki-taka" hallmark and Tata's verticality), so will be interesting to see whether or not Barça can build on this and improve as they go -- the most important concern for them now will be retaining any form of consistency in the level of their performances (esp. away from home!).