Didn't like how they pussified Lancel, frankly. The funny thing about Lancel in the books is that while he was easily dominated by Cersei and Tyrion, in great part because of his youth and inexperience, he was actually physically brave, like most Lannisters.
And while not a great fighter as Jaime was at his age, or a good general as Tywin ditto, Lancel did very well as a knight and an officer during the Battle of the Blackwater, leading several sorties, fighting on while wounded, coming to Cersei to protest Joff's removal from the walls, etc.
I also am disappointed about the differences in Lancel from the books and the show, but I am guessing that the creators are trying to tone down some of the others that they consider side characters, to make the big characters stand out more. I'm not an avid re-reader of the books, but it did seem to me that Lancel was toned down in this, to make Tyrion's going out in battle the big contrast to Joffrey and then the Hound fleeing. I think it would have been just as effective though, if they did still allow Lancel to have more battle efforts on the show.