I've been disappointed a couple of times now reading TER, here's why. I read reviews about one or two providers I had the pleasure of meeting, and it looks like I didn't get all the goods that others have.

ask and you shall receive..

Providers are human and react differently to Clients.  Is it common? Hard to Say
Also reviewers have been known to write about activities that never happened  

Assuming the hygiene issue is off the table, and there's a connection between you two, did you clearly express your desire to kiss her?  Or did you let her take charge and just accepted what was offered.  I've done both, and accept that it's my own fault for not speaking up - and I don't count that against her in a review.

If the john is unclean or some how seemingly unhealthy.

need to be squeaky clean.  Oral hygiene, breath, teeth, etc. all play into this picture.

Besides being freshly Showered, you may have to make multiple visits with her. Usually in my case, when I see a Provider on a steady basis, she's more willing to do what you want. Don't expect her to do everything you want on the very first visit. My current Provider who I've been seeing for well over a year, does EVERYTHING I want without complaint. And even gives me a Regular Client Discount. She's pretty Awesome.

have no clue about their bad hygiene or just don't care. I see (and smell) it all the time in stripclubs. Many of the customers reek of B.O. so bad that I can't imagine a stripper holding her breath long enough to even give them a lapdance. Not saying the OP falls into that category, but poor hygiene is probably one of the major factors in YMWV.

Really? I always shower and shave before seeing a Provider. Any guy that doesn't shower before seeing a Provider is an Idiot.

All I can say is that if any are like the disgusting slobs that I get a whiff of when clubbing, then yes - I'll bet plenty don't shower before a session. I can't imagine it either, considering that you are paying good money to be with the woman - why would you risk not getting a fulfilling experience by not showering either before your arrival or even when you get to her place? Many providers have nice showers at their incalls and encourage those of us coming directly from work or where ever to jump in the shower before the fun starts. Seems almost like a deliberate sabotage not to freshen up.

I've only had incall esperiences so far and I have showered every time before the appointment. You are right though, I have usually only accepted what I was given. But one of the providers I was talking about actually stopped kissing right after I put my tongue into use - even though she had done DFK according to reviews. So the whole thing lasted only a few seconds...

How some people smell so bad and not notice it...they become immune to the stink.  

To be objectionable to see if the hooker will go through with it. When people pay for a service some have this perverse urge to push limit. It's as if they want to see what someone will do or how far someone will go for the money. Sort of a control thing.

How far did you shove your tongue down her throat and then did you wiggle it around vigorously?  

I've heard a lot of complaints about the tonsil hockey technique, which is really middle-school level kissing (another common one is the "woodpecker"). The hobby can be really good practice. Ask her to teach you how she likes it - she'll probably really appreciate the gesture.

Nice trolling, but I have clean teeth and the providers I met two days before and after had no problems with DFKing me, so I don't think my mouth is that filthy.

Wow you really nailed this one...YES.  I believe this to be true in some cases.  Too push like toddlers on your boundaries, knowing they are bothering you but doing it anyway.  Not cool!
 

Wow. I would have never suspected that there are bottom feeders out there that do that. How sad. But I guess you gals see just about everything in this line of work. Yikes.

some providers will start their sessions by showering WITH you, and making sure all your junk is squeaky clean and have a lot of fun doing it.  even clients who have just showered aren't always as thoroughly clean as one would wish given that a lot of focused and intimate attention will be given to their lovely bits.  shower play is sublime and a diplomatic way to ensure you will be touching clean body parts.  use a brown wash cloth and lots of soap and make sure your butt hole and genitals are clean, including under your foreskin!  i personally enjoy man sweat but to be safe for any provider, all old excrement has got to go if you are gonna have the best date possible.