The issues that detract from the products of the big scotch whisky producers (Glenlivet, Glenfiddich) ie.. using shitty old wood, and caramel, are common to the big producers of cognac. If you like bland, inoffensive, yet without character malt, like modern Glenfiddich, please by all means try a cognac from a the big three (Hennessy, Remy, Martell.) Chances are Cognac has a bad name because of the rubbish these marketing machines bottle.
If you want a drink with personality, buy from a grower/producer. Francois Voyer and Paul Giraud are notworthy examples. Both of these guys previously produced cognac and sold it off to the larger houses for their blends, but are now producing under their own label, and you can taste a dramatic difference.
Paul Giraud Elegance is first of all cheap, but matured in young wood, and offers bright, fresh, lively stonefruit characters all wrapped in a soft silky texture.
Francois Voyer Napoleon 15 is a touch more expensive, and offers a more mature, deeper flavour profile, but retains a degree of liveliness and freshness. Perfectly balanced and well priced.
Paul Giraud Heritage is a 50+ year old offering which retails here for 1/10th of what a Dalmore 40yo whisky sells for and is undeniably the finest drink I've ever had - and I've got notes for hundreds of spirits. An ethereal bouquet wafts up from the glass, you can smell it from a distance, lovely dried fruits and generous amounts of exotic spices tease. The palate is plush, vibrant, and loaded with flavour - still very much alive. I could rant on about it forever.