I tried MB'ing Warhammer Online over the last month or two.
Never got high level as I got too frustrated with the mechanics of the game as it relates to MB'ing.
For those of you considering it, let me give you my take:
The game lags like crazy. What this means is that things take far longer to do than in WoW. For example, the lag from moving your main to having the alts move is around 1-2 seconds. Part of this lag is from the autofollow distance "setting" - I'd say it is roughly twice as large as the autofollow distance in WoW.
The macro capabilities are limited at best. This means no "Interact with Target" and no casting macros. So every spell you cast has to be tied to a hotkey on your cast bars. Honestly, this in and of itself is not such a terrible thing. However, when you combine it with the fact that you cannot specify a target associated with a /cast command, and with the lag in the game, you press the /assist macro key a few times (to make sure that it registers and your team has the correct target) then you hit another key (a few times) to cast your spell.
I dealt with these limitations and tried to keep plugging along, as I thought the game in general was kind of neat. But the real killer for me was the "physics" of the game. My team kept getting stuck on rocks and hills that WoW would just let your team run right over. This meant that I had to really focus on making a correct "path" with the leader around obstacles. And since the lag was so terrible, navigating things like a circular staircase was impossible.
It was really this last issue that made me give up and cancel my accounts. Which is too bad really as I had a good time with the other aspects of the game.
