It's true that the asterisks do not automatically denote a point of failure. It's very common for devices to be configured not to respond to external pings. Unless you're seeing an explicit error such as "Destination host unreachable" or something along those lines, simply not getting a response doesn't necessarily mean anything at all. It could mean something, or nothing, you can't really say.
Assuming the last reporting hop in your first traceroute is our best bet to check from, here are the WHOIS results from that IP:
https://who.is/whois-ip/ip-address/4.53.233.25. In there you have phone number email addresses for IP addressing and NOC support. Again, people have already mentioned that without paying for an SLA they don't care -- not really untrue, but like I said, it really does depend who you get. Life in these support roles can be sometimes quite boring during slow times, and helping someone who's asking nicely and the right way, isn't really all that impossible of an occurrence.
I would definitely have at the ready, screenshots (or preferably, copy/pastes from command prompt into a text file, so that they can simply copy/paste instead of manually typing IP addresses) of the poor ping times, and documented times/dates for those. It wouldn't hurt if you could have someone at a different location test pings/traces to the same host at the same time.
Every once in a while we get reports of people having issues with certain game servers, and 99% of the time it never has anything to do with the ISP side. Having said that, it is sometimes within the capability of the ISP to modify the route if it is bad. It really depends what it is about the route that is bad, and what's required to fix it. I've seen some pretty weird stuff before. I just wouldn't bother going to any of these support groups empty-handed, that would be a waste of time for sure.
Out of curiosity, have you seen the same behavior happen across multiple IP leases? What I mean by that is, you likely have a dynamic IP lease assigned to you by your ISP if it's a residential service, which means that your IP address will change from time to time. Some weird things can happen at the end of an IP lease cycle, and i'm just wondering whether the same issue has persisted across more than one lease (different IP address of yours). A different IP can also, under some circumstances, be taking a different route to a given host. I have seen this (just getting a new IP lease) resolve, in certain cases, issues browsing to a single website. If you do get assigned a new IP lease, check the route again to that host and see if it has changed at all and whether you're still seeing the same thing happening.