Whinlatter is much better now than when it first opened.
My gripe was that all of the slippy roots were on blind bends where you were just starting to get some speed going. After a couple of laps i knew they were coming so no big deal. BUT this trail is also marketed for newcomers to biking and i found that 90% of the people i passed were Howard & Hilda types on a break in the lakes. Every one i passed made the same comment about how dangerous it was and they hated it. In that respect the trail was not very good imo. Yes have roots but dont leave them in places where they acted like man traps, have them open and avoidable for joe public. If you have ridden it since the opening you may notice the slight alterations they have made which are a vast improvement.
Other than the above, its doesnt seem any different to all the other man made centres. A nice little blast imo