Bale is actually pretty good at the left sided free kicks. Nearly always gets them over the wall, scores occasionally and usually gets them fairly close. I'll give you the Modric one, not exactly the best free kick taker.
However, Modric's corners are more often than not better than vdV's. As Sibs said, we scored a goal from a Modric corner and Bale flick the other week, tried it again last night and almost came off plus Modric took the Sandro header. Not sure I can remember one corner vdV managed to get past the first man.
Either way, it's not something we're very good at. Just should choose the right takers to give us the best chance of improving. vdV every time isn't that IMO.
As a side note with regards to free kicks, the Kaboul option should be used a little more often than it currently is. Maybe every 5/6 direct free kick we get. We also need to start to play cleverly. Something we never do is put a man on the end of the wall and get that man to give the wall a little nudge, when the oppo player goes to nudge back our player moves out of the way resulting in no resistance and their player separating from the wall. This leaves a nice gap in the centre for someone like Kaboul to have a blast at. It's pretty basic set piece tactics that we rarely, if ever, seem to use but is used against us regularly.