Why you only use wmm? Because you only do transitions?
That's a silly excuse to use, even if you were only placing transitions between replays, other programs can make your transitions more interesting to look at or smoother. Sync is also important and you can't do that in wmm as you only have the option of speeding up 2x or half, there aren't any in-betweens that could make your video any better than that.
Also, it's just lazy that you would put a description in your video that you won't put on this thread. It's just a matter of copy and pasting and would save everyone the trouble of having to go there