Well, i have not played Tactics, so i cannot offer my opinion except what i have read on the Wiki, and how it clashes with Canon, except that they have fallen on hard times. I think they will need a revision in order to be done properly with Canon sources, as from what i have read, they need it, for the most part. I will not pass solid judgement until i play it, but that is my humble opinion.
Fallout Tactics does not mess with Canon. Let me tell you why people turned on Tactics.
Fallout Tactics has a location called Vault Zero. Vault Zero is built in Cheyenne Mountain. Now Vault Zero is home to the Calculator which is the main protagonist of Tactics. Tactics was released in 2001.
Now another Game set to be released in 2003 also had Cheyenne Mountain as a location in the game but its Cheyenne Mountain was to be very different then the one in Tactics. It was to be "The Crater" a very larger and very radioactive hole in the ground, what is left of NORAD. It was to be home to many glowing ghouls. This game was to be Fallout 3 aka Van Buren but it was cancelled and therefore not Canon.
Now Tactics was published and Van Buren was cancelled so therefore Tactics can't go against it and therefore Tactics does not mess with Canon. All fallouts have inconsistencies.
All the other "Canon breaking" things of Tactics can be logically explained. I find it easier to explain any "inconsistencies" in Tactics then it is to explain the ones in FO3 yet everyone agrees FO3 is fully canon.