I've heard multiple Catholic and Orthodox people criticize Baptist churches for being smaller and less beautiful. But does that matter ? It doesn't matter at all. Two of the main goals of a church is to preach the gospel (Mark 13:10, Mark 16:15, Luke 9:6) in order to save people from hell and preach against sin (1 Timothy 5:20, 2 Timothy 4:2) in order to save people from being punished on Earth (1 Corinthians 5:5).
The Bible shows in Acts 8:26-39 and Luke 23:42-43 that people can be saved without being in church. And preaching against sin can be done in any church. It can even be done online. So, the size and beauty of a church isn't very important. Christians shouldn't have ugly churches. But a normal building can do the job. People can be saved and hear good preaching in a normal building.
Christians shouldn't have very small churches where only 3 people can fit. But there is no problem as long as the building is big enough for everybody and the pastor preaches the right doctrines. In other words, having a small church doesn't mean God is not there. It doesn't mean the church is not a good, godly one.
What matters is, does the church preach the truth or does it contradict the Bible all the time ? The size and beauty doesn't really mean something. Muslims have big beautiful mosques, Jews have big beautiful synagogues, but the Bible says that people who deny Jesus is the Christ (Messiah) are liars (1 John 2:22). Catholics have big beautiful churches, but their paintings show Jesus as effeminate. And the Bible says that being effeminate is a sin (1 Corinthians 6:9,1 Corinthians 11:14). So Catholics depict Jesus as a sinner and this is blasphemy.