Would disagree, been using it for the last 2 years, always book a King Deluxe and get upgraded to a King Deluxe Suite.
The hotel was formerly a NovaTel, which the local Hilton Franchisee took over and carried out some basic re-branding on the outside as well as the reception area. Starting March / April next year they will be carrying out further refurbishment so expect prices to rise. Did notice last week the bathroom floor mat still had a large "N" on it.
While not in Silom, the new Hilton Metropolis Suites just off Sukhumvit Soi 39 also is even better value for money. Again an ex NovaTel bought by the same Franchisee. Admittedly no Exec lounge, resturant or bar, but no issues bringing fellow philatelists to admire your collection in your spacious studio or 1 bedroom apartment!
For absolute value for money, then the Garden Inn down in Rayong. Was paying 1200THB a night and getting upgraded to a suite. Night life was a bit thin on the ground, but a cheap way to build your points.