Revolutionary Love really isn't all that revolutionary, and I think the expectations of the viewers got in the way of enjoying the drama for many people.  This drama isn't anything spectacular imo, but I don't quite get the vitriol as if it is the worst thing ever either.  I think this is pretty standard k-drama fare and if expectations are middle of the road, one can still enjoy some of the upsides of this drama while knowing that there are some downsides as well.  I'll start there.

Cons:  

Tone:  I will just say it.  The dad is abusive and beats on his son and subordinate.  Not slap or hit as we see in so many dramas.  Beat.  And then we are supposed to see and accept that there is an upside to this guy at the same time.  I believe this actor played the bad guy in The Time Between Dog and Wolf, and he was fantastic at portraying a tragic, flawed and yet sympathetic character all at the same time.  Unfortunately, the script or direction didn't help him here.  Many dropped at this point.

What Love?:  If you expect romance to be a big part of this drama, stop right here and back away.  I get it....love is in the title of the drama but this has a very mild love story and to a certain extent the writer doesn't seem to know what to do with it.  It is because of this woman that he is changing; that's been true of many dramas but the writer doesn't commit to how she feels about him really.   Writer also throws in  a totally unbelievable love triangle

Pacing: There is bromance, but I don't think it flourished like it could have because something that needed to be revealed didn't happen until too late.  I think this is unfortunate because this drama is at its best when the three friends are all for one and one for all like the 3 Musketeers so to speak.  

Pros:

Change:  Unlike many, I was happy that change of the main character didn't happen that quickly.  There is something around episode 4 wherein many viewers got really frustrated at the continued immaturity of Siwon's character.  I am in the minority that LIKED that he didn't change that quickly because, guess what, people don't.  If this drama's theme is that caring about people can bring about positive change in others, fine but it is still going to take time and it does.  

Actors:  So Siwon is a bit OTT here but some of that we learn is a facade to deal with the brutality of his father and some of it is his personality and doing what is expected of him.  It was a bit much and I think the writer/director should have dealt with that because I think it is more on them.  They wanted a definite comedic vibe even if it didn't always suit the tone. (See Con)  Kang Sora is fine and shows she can be dramatic and funny but I actually think this wasn't a hugely challenging role for her.  Gong Myung is really good here as the woe is me salaryman.  I just wish there had been some earlier evolution in his character because I think he doesn't crack a smile for 15 episodes.

Story:  Okay, full disclosure, I'm a sucker for a friends helping friends story.  I like the cleaning crew gang, I like the three helping each other out.  I like the flight attendant/cop combo.  I like people working to change because so often in the real world, people stay in their ruts.  So, yes, this drama worked better for me than others.  I freely admit by the last four or so episodes I was folding my laundry and wrapping Christmas gifts while watching but that's fine, it worked for me.  

I would say that if you keep expectations in the middle and realize romance is very very limited, there is a solid k-drama here.  Not anything fantastic or life changing but pleasant enough.  For a better office/friends drama there is Radiant Office and, of course, the excellent Misaeng.