Garthanos
Arcadian Knight
One can say the 4e guidelines were pretty solid at low levels. (notice there is an unspoken but... in there) So I will speak it the but is that if players are interested in optimizing or just use some of the feat tax feats you will need to make things harder than the guidelines suggest, as your characters level and the best advice on the latter is... wing it. The Guidelines working generally meant the DM kind of knew better when he was hitting them hard, and I heard from quite a few DMs that they killed more PCS in 4e than previous editions because they felt less like it was random chance but rather actual choices involved.