Come on Richie you can do better than that?

Well I could point to his missed tackle stats on Superleague.co.uk, they're pretty harsh.
If my memory was any good I'd remember who the other coach, other than Justin Marshall, was who was seen on Boot 'n' all giving a team talk and gameplan of "whenever Westerman is in the middle, run at him"

Yeah if you remember the rest of the quote it was "to tire him out"

Which is why missed tackles is sometimes more use.
High tackle counts typically mean one of two things: hard working defender, or a target for the opposition.
The number of tackles Westerman misses would suggest the latter.