I can't see a Meerlust Merlot on TWS site, but if they do have the 2005 vintage, that was rated higher than the 2006 by Platter on release.
2006 vintage was good in the Cape but Merlot generally hasn't a good reputation as a varietal, and it would be at the bottom of my choices of a red Cape varietal.
Tim James summed up* Merlot in the Cape thus
Quote:
That problem is that the wines easily show a green, unripe character. “Choc-mint” is a common tasting note for the many less successful merlots. When herbaceousness combines with lushness and massive alcohol resulting from leaving the grapes hanging long on the vine in the hope of attaining true ripeness, well, the combination can be grim.
According to the fact sheet the 2006 Merlot had 14% Cab Franc, just under the limit to allow the wine to be a Merlot varietal.
*
http://grape.co.za/2011/04/a-rare-triumphant-merlot/