West Stand Man
Not to mention that many decent rugby clubs have pitches that would be welcomed in most football stadiums. Twickers, for instance, has a superb lush pitch that Wembley would be proud of.
Twickenham is only used about 10 times year. It'd be shocking if it didn't have a good surface.
it isn't rugby, per se, that causes the problems; it is a mix of poor grass, possibly poor maintenance, and poor weather. At least it hasn't also been a drainage problem this year.
Normally rugby isn't a problem. Get a rugby match played after a prolonged period of very wet weather though, and it really knackers the pitch for weeks.