A common example would be a professor who is too mild in his marking of a poor assignments. Another example could be someone who doesn't add or say much with his words, but still receives a lot of credit (*gets a lot of votes) from voters during an election. Another example might be a rather poor musical performance which, however, is being (too) highly praised by the audience. A mum, who praises her 10 year old son too easily on tasks (such as, getting dressed, drinking his cup with two hands, ignoring his teat) that a 4 year old would normally be praised on.
closed as too broad by Kristina Lopez, user66974, anongoodnurse, choster, tchrist♦ May 29 '14 at 22:29
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The professor sounds like someone who is lax in their grading. He allows for a lot of mistakes in the work of his students. You could say the voters were lenient on their judgement of the politician. Or maybe that they are easy to please. The same goes for the crowd. Easygoing, (over)permissive, or over-tolerant are similar words you could use in similar situations.
The only word I can think of for someone/an entity (a crowd, etc.) who gives affirmation too easily is a pushover.
Clear, concise, fair, but no pushover! An outstanding prof!
I just got the attached paper back with "A+ Incredibly Well Done, I'm Impressed" on it. What a pushover that prof is!
I'd say OP's professor could be called...
indulgent - having or indicating a readiness or over-readiness to be generous to or lenient with someone
Of course, there might be justifiable/cynical reasons for such behaviour. Perhaps the prof thinks that by (excessively) praising even small efforts made by his students, he might get them interested in masking greater efforts to gain even more praise. Most parents do this a lot, because they want to teach their children to value praise.
Another possibility is an indulgent audience at, say, the World Championship Snooker Final. If one of the finalists is having an "off day", the crowd may well erupt in resounding applause when he finally pots a ball. They came to watch a hard-fought match, not a walkover, so they naturally want to encourage the faltering player to take heart and even things up a bit.
As a general term, those you tend to give credit easily can be considered superficial in the sense of:
displaying a lack of thoroughness or care:
concerned with or comprehending only what is apparent or obvious;