Lets go over why people like or dislike faith. The stat was implemented in DmS first so obviously it is something that FROM wanted to accomplish and make very fun.
I personally think that Faith is "cool" or interesting based off of how unique the idea is. No other game of this quality has made a faith stat and made it useful as well. Faith for me is fun because it's both an alternative and a counter to many magic and other "overpowered Strategies." Faith also lets me play a more tankish like character which I enjoy. My one complaint is that we (as in faith based users) are not as versatile in certain ways as pyromancy and magic. I find faith to be balanced well though. It is a paladin's/healer's last defense under extreme pressure. it will make your opponent think twice before rushing in.
Now I wanted to go over a few things specifically about faith. The first thing I suppose I will touch on is TWoP. A lot of people are still very bitter towards this spell. I think it was an incredible way to work around the imbalance of glass cannons smoking tanks from DmS. In DmS our protection was limited to regen magic and revive. The regen magic is barely in DkS so there went half the defense faith users used to have. I also believe that if you choose faith over magic you are basically saying I like tanking. Tanking should be an option. There is no Second Chance (or revive) in DkS. This alone cuts our chances of survival (which is the idea) by another decent margin. That being said our healing spells are slightly more varied, but a well placed sword in the face pretty much negates that. Back Stabs run very rampant in both games but they got a significant buff in the new game. TWoP did a good job of countering these glass stabbers (some say too good) and so it was nerfed. both in duration and in strength. It is now limited and difficult to pull off successfully. These once stunned glass cannons have much more freedom to completely negate the aspect of tank in this game. I find myself having a very limited time to get to my opponent after casting TWoP and what do they do? back pedal or rush around for a bs. The spell is absolutely useless in the grand scheme of things. The hatred for this spell should have dispersed by now. Get over it. Your toons can now punish anyone who uses it and quite easily I might add. The characters you lost are dead and gone now. It is in the past and I feel as if the community should move on from this malcontent of a now relatively weak countering spell. In the immortal words of the baboon from The Lion King,"it is time", or "It doesn't matter, it's in d'past!"
DMB/SLB seem to be getting a lot of attention since TWoP has become less frequent. At this point it is a matter of the whole mechanic that people hate. No one mentions healing spells because its a defensive strategy that is so easily punishable hardly anyone uses it. DMb and SLb stack up right next to the sorcery equivalent. CMW/GMW, and in fact sorcery gets more options earlier in the game too. I'm not going to explain to you that DMB or SLB is easy to counter or such because I think we all know the outcome of a battle no matter what buff you use. If you get hit by a buffed weapon it is going to hurt and if you expect any less of that then you are being bias and ignorant.
To close, I would like for people to comment, but in a civil manner on the faith mechanic. You don't have to comment me or talk about the same things I did, but just explain in your own words why you don't or you do like the mechanic. Thank you and have a nice day.