I've watched Discovery Real Time (+1/Extra) to death and probably seen all the different programmes thrice over! The presenter is definately the main draw for me. People like Paul Young, Geoffery Palmer just didn't make the programme enjoyable for me. I appreciate the angle of the The Compleat Angler, but he doesn't seem to be taking it all that seriously and doesn't really come across as someone that enjoys fishing.
Paul Young just reminds me of grey skies above a featureless 500 acre loch somewhere fly fishing for trout. Has it's niche, but doesn't draw a large audience.
Fishing with Henry is a strange one for me, I don't usually watch sea fishing with any real interest, but again the presenter really makes the show. His genuine enthusiasm for it, and reacting so extremely to every up and down throughout the show draws the audience into his adventures. If I can enjoy it, then I bet that Fishing with Henry get a lot more views than you'd think.
Matty Hayes and Mick Brown are great as presenters as they just bounce off each other in front of the camera. Again, they show dedication with huge feats to acomplish within a series, an example being The Great Rod Race. Although Matt does shove his sponsor baits in your face all day, it's good fishing of a huge variety of species and subsections for rig tips and tackle.