I feel like you're trying a little too hard to play down his goals, no matter who he scores them for or who he scores them against. Leaning a little to hard in to similar arguments made by you know who in the Kane thread. If he scores 5 it's because the defence was bad (And come on .. look at some PL defences like Leeds or Everton) and if he bangs in CL goals its because the team is really good. Then with Poland the opposition is poor .. although in the Euros his 3 goals in 3 games came against Spain & Sweden, both ranked top 15 at the time.
If you don't rate him as highly as Kane that's fine, I'd expect nothing less from a Spurs fan! But all strikers fill their boots against lesser opponents and will benefit from top teams, this isn't unique to Lewa. Would Kane's productivity go up playing for Bayern? Absolutely. I do think he'd score more goals in 'big games' as well. But that still doesn't take away from how impressive some of Lewandowski's goals on such occasions are, and it proves he's not just a flat track bully taking advantage of a weak league.