3 things you need to know from Tuesday's Champions League action

Goals were the theme on Matchday 3 of the Champions League.

Tuesday's slate of fixtures featured an astonishing 40 goals, including three matches where the victor scored six goals or more.

theScore's Gordon Brunt, Carlo Campo and Gianluca Nesci run down three things you need to know from Tuesday's Champions League action.

Bayern Munich a class above

Gianluca Nesci: Roma is a very good, very young side with enormous potential. Rudi Garcia has seen his club garner plenty of plaudits this season, all of which deserved.

On Tuesday, the manager was forced to watch on in horror as his team, and in particular his defense, became the whipping boy of European football - at least for the night.

Jokes were made and laughs were had at the expense of a side that was thoroughly battered, losing 7-1 to Bayern Munich on home soil.

It had shades of Germany's humiliation of Brazil at this summer's World Cup, with an early goal followed by a mesmerizing flurry in the middle of the opening half effectively ending the contest.

But unlike that World Cup contest - which was littered with circumstances that contributed to the result - what we witnessed on Tuesday at the Stadio Olimpico was much more simple.

Bayern Munich is a world class team, comprised of world class players at every position. For all the good that Roma has done this season, and for all the promise they contain, the gulf in quality was evident on this memorable night. It's something that many people seem to have forgotten.

Three teams in the world at the moment are capable of strutting into a sold-out Stadio Olimpico, against a quality side like Roma, and imposing their will in such a devastating fashion as to make them look like schoolboys. Pepe Guardiola's Bayern is one of them.

The scoring list alone reads like an all-star list of players, because that's exactly what it is. Arjen Robben (two goals), Mario Gotze, Robert Lewandowski, Thomas Muller, Franck Ribery and Xherdan Shaqiri. The latter two scored after coming off the bench. 

Manuel Neuer made one of the greatest saves you will ever see, just to remind everyone that, yes, they're good at the back as well. A hurricane ripped through the Italian capital tonight, and Roma just happened to be standing in its way.

Controversial penalty leaves Manchester City's Champions League campaign in ruins

Carlo Campo: Before the floodgates opened and it began hailing goals across Europe, some serious controversy went down in Tuesday's early Champions League fixture between CSKA Moscow and Manchester City.

After going up 2-0 in the first half courtesy of goals from Sergio Aguero and James Milner, City saw their lead get cut in half in the 64th minute. Seydou Doumbia, who was lying on his back on a stretcher only moments earlier, slotted home the goal for CSKA from three yards out.

Fast forward to the 85th minute. Just when it seemed liked Doumbia couldn't frustrate City any more, the forward earned his side a late penalty with a theatrical dive as Aleksandar Kolarov attempted to intercept a cross into the box.

Judge for yourself, but it's pretty obvious that Doumbia went down a tad too easily.

(Courtesy: Reddit user "NatrolleonBonaparte")

Midfielder Bibras Natkho stepped up to convert the ensuing penalty, leaving City sitting third in Group E with only two points from their opening three fixtures.

While Manuel Pellegrini's side were handed a lifeline in Bayern's subsequent trashing of Roma, their chances of progression look slim as they'll likely need nothing less than three points when they visit Roma in December.

Why City have been unable to replicate their domestic form in Europe is the subject of much debate. Though, it would be ridiculous for the club's supporters to pin their impending elimination on the dubious penalty earned by Doumbia. To put it simply, City have been a train wreck in the Champions League.

It's also worth noting that the match, which was played behind closed doors due to off-the-pitch incidents that marred CSKA's loss to Roma last month, took place in freezing conditions. Minus-two degrees Celsius, to be specific. Perhaps that had something to do with City's collapse.

Shakhtar Donetsk's record-breaking performance against BATE Broisov

Gordon Brunt: Shakhtar Donetsk's match against BATE Broisov was always going to be a fixture watched primarily by supporters of each team, while the vast majority of neutral fans were glued to matches that featured Bayern Munich, Barcelona, Chelsea and other football powerhouses on Tuesday.

The match, however, proved to be one for the ages after Shakhtar Donetsk pounded the back of the net seven times, setting various club and Champions League records along the way.

Shakhtar forward Luiz Adriano was the star of the day. The Brazilian striker added the team's second goal inside the half hour mark. Though, he wasn't finished with his scoring rampage against the Belorussian team.

Adriano added three more goals before the half was finished, earning him the distinction being the first player in Champions League history to score four goals in the first half of a match. He also scored the fastest hat trick in the tournament's history. But it was his third goal of the game that solidified him as a club legend.

The half concluded with the visitors holding a commanding 6-0 lead, yet another record for the Ukrainian club.

With their opponent's essentially defeated after the first 45, Shakhtar took its foot off the gas following the break.

As both squads trudged towards the final whistle, Shakhtar earned its second penalty of the match, with Luiz stepping up to the spot. He converted and etched his name into the Champions League history books once again.