If you're planning on being an offtank, the points are best spent other places imo, but it's definitely helpful for 5mans and for pvp'ing.
In a 25 man you will most likely ALWAYS have the debuff being applied by a different class, and in 10 man you should have a warrior or pally MT so you can OT and kitty deeps.
There are times when you have to MT, even in raids, and in those times you'll see those talents show through, but with that rationality you'll see just as much use out of Primal Tenacity or something similar.
Really, in the end, it just depends on what your guild expects out of you and typical raid setups for 10 mans - since as I mentioned, in 25 mans it's irrelevant.