Generic shounen isn't innately BAD or anything. As far as entertainment value goes, generic setups deliver. The problem is avoiding all the traps that shounen authors generally fall into.
For starters, oblivious and/or overly benevolent protagonists will make the series shit. It's probably a defense mechanism against having things get resolved too early, since having the protagonist hook up with his love interest or having the protagonist finish off his opponents will shorten the length of the series considerably. A GOOD author would buffer the time with ACTUAL DEVELOPMENT but a BAD author just adds in lulzy shit to prolong the series and it turns to garbage.
Also, distinct power levels will limit a series' flexibility because there could be a wealth of interesting characters within the series but their interactions with each other will be restricted by the tiers of power (see: Bleach). GOOD authors will give characters distinct abilities but NOT distinct power levels so that their interactions can be more unique and battles will be more about strategy and how the abilities and individuals compare to each other rather than having potentially one sided matchups. Sometimes authors try to correct this by having a weaker tier character win against a higher tier one but the manner in which this is achieved is almost always ridiculous or contrived.