Wolfenstein tno is is worth playing but only just. If you just want to be occupied a few hours with something fairly mindless then it'll do the trick but don't be expecting greatness in any way.
I can think of many weakness this game has but hardly any pros...
Pros: It's accessible and there are few puzzles or other nasties to break immersion
Cons: Cartoony style of graphics was disappointing and made the game seem fake and inconsequential
Few weapons - and once you get the laser gun, the other weapons become largely redundant
Uninteresting perk system - I just couldn't be bothered for the most part.
Ridiculous story and the characters just didn't do it for me
Combat didn't seem terribly cerebral - just a gallery shooter with a few cover options, mainly.
And that's really about all I have to say about wolf tno. Definately not as good as rtcw.