1. How you get access should not influence your opinion on the course. At least for myself, I find that the weather, time of day and who I am playing with subconsciously influence my opinion of a course much more than how I gained access.
2. However, it certainly should influence whether you publicly criticize the course. I would never criticize a golf course in which I was the guest of someone - it is just disrespectful of your host. I simply follow the "if you don't have something good to say, don't say anything at all". For instance, there is a nationally ranked course that I have played where I was the guest of someone. I was not overly impressed with the course. When people ask me about the course, I mention things I liked about the course - it was the best maintained golf course that I have ever played and had the best member services that I had ever experienced, course was a great test of my golf game - all of which are true. I did not say that it was a ton of fun to play or that there were a lot of interesting choices through the round or that the greens were interesting.
3. I will be truthful and admit that I probably do let the architect influence my opinion. However, I don't necessary think that is necessarily bad. My opinions have been formed based on personal experience and when I enjoy multiple courses by one architect, I should expect to enjoy another of his courses. Likewise, if I have not enjoyed other courses by another architect, I should be inclined to think that I won't enjoy a new course. For instance, I really enjoy Pete Dye golf courses (esp. Pete Dye GC in WV). I found that almost every course that I have played by him, I find myself battling staying focused on hitting good, aggressive shots instead of escaping the trouble. On the contrary, I have not enjoyed the RT Jones courses that I have played. I find them great tests of golf (I know the weaknesses of my game after playing them), but they are not very interesting or fun to play and rarely play mental games on you.