I can't comment specifically on WJ at Whistler Creek, though I am familiar with some of the other WJ properties.
IIRC - Whistler Creek was the first WJ property. As such it it has fewer amenities. The units should be quite roomy - it's not unusual for a 2-bedroom in the older WJ properties to be well over 1000 sf.
You can expect the unit to be clean and in good condition. In appearance the property will likely seem dated; it will probably have typical of 1980's era dark wood finishes and architectural details. But as a WJ property it should be well maintained and clean.
Because Whistler Creek in not located in the heart of Whistler Village, unlike most other "vintage" WJ properties Whistler Creek does not have high night noise levels. In addition, as mentioned above the Creekside area has been upgraded substantially in recent years.
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If all you're looking for is nice quiet place to stay while you are in Whistler, Whistler Creek should be perfectly fine. If amenities are important to you (hot tub, swimming pool, exercise room, etc.) you should consider another property.
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Should you take this unit (or any other WJ unit) be aware that check-in for all WJ units is at one central location in Whistler Village. Some of the WJ properties (such as the Creekside properties and Ironwood) are 5 to 10 km from the Whistler Village check-in.