Large Size? No..... I'm pretty sure large size is positive. Reach is so...... powerful in DnD. Powerful enough as to out weigh the 1 AC and 1 to hit. In fact, those 2nd two things are super easy to get, while reach is hard. Seriously, Large Size is, IMO, at least stronger than every moderate abiltiy on the list. There is no way it's a monor ability.
No melee character would want to NOT have large size if the players are statting their own races and races with it will overshadow others when optimized, if the DM makes the races.